Internet Engineering Task Force (IETF)R. Shekh-Yusef, Editor
Request for Comments: 7616Avaya
Obsoletes: partnersuche heilbronn kostenlos runterladenD. Ahrens
Category: Standards TrackIndependent
ISSN: 2070-1721S. Bremer
Netzkonform
September 2015

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online dating sites for filipinas The Hypertext Transfer Protocol (HTTP) provides a simple challenge-response authentication mechanism that may be used by a server to challenge a client request and by a client to provide authentication information. This document defines the HTTP Digest Authentication scheme that can be used with the HTTP authentication mechanism.partnersuche akademikerinnen single

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top dating sites for filipinas This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 5741.single page website template for wordpress

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partnersuche 30 This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English.online dating websites hyderabad


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singles nürnberg ohne anmeldung HTTP provides a simple challenge-response authentication mechanism that may be used by a server to challenge a client request and by a client to provide authentication information. This document defines the HTTP Digest Authentication scheme that can be used with the HTTP authentication mechanism.online dating website ranking

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kostenlos online auto spiele The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].online dating scams on facebook

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partnervermittlung weg zu zweit lyrics The Digest scheme is based on a simple challenge-response paradigm. The Digest scheme challenges using a nonce value and might indicate that username hashing is supported. A valid response contains an unkeyed digest of the username, the password, the given nonce value, the HTTP method, and the requested URI. In this way, the password is never sent in the clear, and the username can be hashed, depending on the indication received from the server. The username and password must be prearranged in some fashion not addressed by this document.bin frau suche frau thailand

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funktionieren online partnerbörsen An optional header field allows the server to specify the algorithm used to create the unkeyed digest or digest. This document adds SHA-256 and SHA-512/256 algorithms. To maintain backwards compatibility with [RFC2617], the MD5 algorithm is still supported but NOT RECOMMENDED.bewertung singlebörsen schweiz

türkische partnervermittlung ukraine The size of the digest depends on the algorithm used. The bits in the digest are converted from the most significant to the least significant bit, four bits at a time, to the ASCII representation as follows. Each sequence of four bits is represented by its familiar hexadecimal notation from the characters 0123456789abcdef; that is, binary 0000 is represented by the character '0', 0001 by '1' and so on up to the representation of 1111 as 'f'. If the MD5 algorithm is used to calculate the digest, then the MD5 digest will be represented as 32 hexadecimal characters, while SHA-256 and SHA-512/256 are represented as 64 hexadecimal characters.dating app muslime

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türkische partnervermittlung cpd If a server receives a request for an access-protected object, and an acceptable Authorization header field is not sent, the server responds with a "401 Unauthorized" status code and a WWW-Authenticate header field with Digest scheme as per the framework defined above. The value of the header field can include parameters from the following list:bin frau suche mann

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  • A quoted, space-separated list of URIs, as specified in [RFC3986], that define the protection space. If a URI is a path-absolute, it is relative to the canonical root URL. (See free single page wordpress theme of [RFC7235].) An absolute-URI in this list may refer to a different server than the web-origin [RFC6454]. The client can use this list to determine the set of URIs for which the same authentication information may be sent: any URI that has a URI in this list as a prefix (after both have been made absolute) MAY be assumed to be in the same protection space. If this parameter is omitted or its value is empty, the client SHOULD assume that the protection space consists of all URIs on the web-origin.
  • This parameter is not meaningful in Proxy-Authenticate header fields, for which the protection space is always the entire proxy; if present, it MUST be ignored.

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  • A server-specified string which should be uniquely generated each time a 401 response is made. It is advised that this string be Base64 or hexadecimal data. Specifically, since the string is passed in the header field lines as a quoted string, the double-quote character is not allowed, unless suitably escaped.
  • The contents of the nonce are implementation dependent. The quality of the implementation depends on a good choice. A nonce might, for example, be constructed as the Base64 encoding of partnervermittlungen online test
             timestamp H(timestamp ":" ETag ":" secret-data)
    
  • where timestamp is a server-generated time, which preferably includes micro- or nanoseconds, or other non-repeating values; ETag is the value of the HTTP ETag header field associated with the requested entity; and secret-data is data known only to the server. With a nonce of this form, a server would recalculate the hash portion after receiving the client authentication header field and reject the request if it did not match the nonce from that header field or if the timestamp value is not recent enough. In this way, the server can limit the time of the nonce's validity. The inclusion of the ETag prevents a replay request for an updated version of the resource. Including the IP address of the client in the nonce would appear to offer the server the ability to limit the reuse of the nonce to the same client that originally got it. However, that would break because requests from a single user often go through different proxies. Also, IP address spoofing is not that hard.
  • An implementation might choose not to accept a previously used nonce or a previously used digest, in order to protect against a replay attack. Or, an implementation might choose to use one-time nonces or digests for POST or PUT requests and a timestamp for GET requests. For more details on the issues involved, see bin frau suche frau wien of this document.
  • The nonce is opaque to the client.

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  • A string of data, specified by the server, that SHOULD be returned by the client unchanged in the Authorization header field of subsequent requests with URIs in the same protection space. It is RECOMMENDED that this string be Base64 or hexadecimal data.

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  • A case-insensitive flag indicating that the previous request from the client was rejected because the nonce value was stale. If stale is true, the client may wish to simply retry the request with a new encrypted response, without re-prompting the user for a new username and password. The server SHOULD only set stale to true if it receives a request for which the nonce is invalid. If stale is false, or anything other than true, or the stale parameter is not present, the username and/or password are invalid, and new values MUST be obtained.

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  • A string indicating an algorithm used to produce the digest and an unkeyed digest. If this is not present, it is assumed to be "MD5". If the algorithm is not understood, the challenge SHOULD be ignored (and a different one used, if there is more than one).
  • When used with the Digest mechanism, each one of the algorithms has two variants: Session variant and non-Session variant. The non-Session variant is denoted by "<algorithm>", e.g., "SHA-256", and the Session variant is denoted by "<algorithm>-sess", e.g., "SHA-256-sess".
  • In this document, the string obtained by applying the digest algorithm to the data "data" with secret "secret" will be denoted by KD(secret, data), and the string obtained by applying the unkeyed digest algorithm to the data "data" will be denoted H(data). KD stands for Keyed Digest, and the notation unq(X) means the value of the quoted-string X without the surrounding quotes and with quoting slashes removed. flirtbörse kostenlos chip
         For "<algorithm>" and "<algorithm>-sess"
    
             H(data) = <algorithm>(data)
    
         and
    
             KD(secret, data) = H(concat(secret, ":", data))
    
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         For the "SHA-256" and "SHA-256-sess" algorithms
    
             H(data) = SHA-256(data)
    
  • i.e., the digest is the "<algorithm>" of the secret concatenated with a colon concatenated with the data. The "<algorithm>-sess" is intended to allow efficient third-party authentication servers; for the difference in usage, see the description in partnervermittlung dom republik wetter.

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  • This parameter MUST be used by all implementations. It is a quoted string of one or more tokens indicating the "quality of protection" values supported by the server. The value "auth" indicates authentication; the value "auth-int" indicates authentication with integrity protection. See the descriptions below for calculating the response parameter value for the application of this choice. Unrecognized options MUST be ignored.

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  • This is an OPTIONAL parameter that is used by the server to indicate the encoding scheme it supports. The only allowed value is "UTF-8".

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  • This is an OPTIONAL parameter that is used by the server to indicate that it supports username hashing. Valid values are: "true" or "false". Default value is "false".

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  • A string of the hex digits computed as defined below; it proves that the user knows a password.

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  • The user's name in the specified realm. The quoted string contains the name in plaintext or the hash code in hexadecimal notation. If the username contains characters not allowed inside the ABNF quoted-string production, the username* parameter can be used. Sending both username and username* in the same header option MUST be treated as an error.

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  • If the userhash parameter value is set "false" and the username contains characters not allowed inside the ABNF quoted-string production, the user's name can be sent with this parameter, using the extended notation defined in [RFC5987].

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  • Indicates what "quality of protection" the client has applied to the message. Its value MUST be one of the alternatives the server indicated it supports in the WWW-Authenticate header field. These values affect the computation of the response. Note that this is a single token, not a quoted list of alternatives as in WWW-Authenticate.

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  • This parameter MUST be used by all implementations. The cnonce value is an opaque quoted ASCII-only string value provided by the client and used by both client and server to avoid chosen plaintext attacks, to provide mutual authentication, and to provide some message integrity protection. See the descriptions below of the calculation of the rspauth and response values.

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  • This parameter MUST be used by all implementations. The nc parameter stands for "nonce count". The nc value is the hexadecimal count of the number of requests (including the current request) that the client has sent with the nonce value in this request. For example, in the first request sent in response to a given nonce value, the client sends "nc=00000001". The purpose of this parameter is to allow the server to detect request replays by maintaining its own copy of this count -- if the same nc value is seen twice, then the request is a replay. See the description below of the construction of the response value.




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  • This OPTIONAL parameter is used by the client to indicate that the username has been hashed. Valid values are: "true" or "false". Default value is "false".

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      response = <"> < KD ( H(A1), unq(nonce)
                                   ":" nc
                                   ":" unq(cnonce)
                                   ":" unq(qop)
                                   ":" H(A2)
                          ) <">

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      A1       = unq(username) ":" unq(realm) ":" passwd

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      passwd   = < user's password >

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      A1       = H( unq(username) ":" unq(realm) ":" passwd )
                     ":" unq(nonce-prime) ":" unq(cnonce-prime)

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      A2       = Method ":" request-uri ":" H(entity-body)

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   username = H( unq(username) ":" unq(realm) )

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   username="Mufasa", realm="[email protected]"

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   Mufasa:[email protected]:Circle Of Life

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gratis single seite löschen The "Method" value is the HTTP request method, in US-ASCII letters, as specified in partnervermittlung dominikanische dollar of [RFC7230]. The "request-target" value is the request-target from the request line as specified in partnersuche erste nachricht youtube of [RFC7230]. This MAY be "*", an "absolute-URI", or an "absolute-path" as specified in bewertung singlebörsen test of [RFC7230], but it MUST agree with the request-target. In particular, it MUST be an "absolute-URI" if the request-target is an "absolute-URI". The cnonce value is a client-chosen value whose purpose is to foil chosen plaintext attacks.partnervermittlung dominikanische republik

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partnervermittlung witwer gesucht The Authentication-Info header field and the Proxy-Authentication-Info header field [RFC7615] are generic fields that MAY be used by a server to communicate some information regarding the successful authentication of a client response.partnersuche dicke menschen

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  • The value of the nextnonce parameter is the nonce the server wishes the client to use for a future authentication response. The server MAY send the Authentication-Info header field with a nextnonce field as a means of implementing one-time nonces or otherwise changing nonces. If the nextnonce field is present, the client SHOULD use it when constructing the Authorization header field for its next request. Failure of the client to do so MAY result in a request to re-authenticate from the server with the "stale=true".
    • Server implementations SHOULD carefully consider the performance implications of the use of this mechanism; pipelined requests will not be possible if every response includes a nextnonce parameter that MUST be used on the next request received by the server. Consideration SHOULD be given to the performance vs. security tradeoffs of allowing an old nonce value to be used for a limited time to permit request pipelining. Use of the nc parameter can retain most of the security advantages of a new server nonce without the deleterious effects on pipelining.

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  • Indicates the "quality of protection" options applied to the response by the server. The value "auth" indicates authentication; the value "auth-int" indicates authentication with integrity protection. The server SHOULD use the same value for the qop parameter in the response as was sent by the client in the corresponding request.

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  • The optional response digest in the rspauth parameter supports mutual authentication -- the server proves that it knows the user's secret, and with qop=auth-int also provides limited integrity protection of the response. The rspauth value is calculated as for the response in the Authorization header field, except that if qop is set to "auth" or is not specified in the Authorization header field for the request, A2 is
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          A2       = ":" request-uri
    
    and if "qop=auth-int", then A2 is skout dating site for pc
          A2       = ":" request-uri ":" H(entity-body)
    

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  • The cnonce value and nc value MUST be the ones for the client request to which this message is the response. The rspauth, cnonce, and nc parameters MUST be present if "qop=auth" or "qop=auth-int" is specified.

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partnersuche hameln yücel The client response to a WWW-Authenticate challenge for a protection space starts an authentication session with that protection space. The authentication session lasts until the client receives another WWW-Authenticate challenge from any server in the protection space. A client SHOULD remember the username, password, nonce, nonce count, and opaque values associated with an authentication session to use to construct the Authorization header field in future requests within that protection space. The Authorization header field MAY be included preemptively; doing so improves server efficiency and avoids extra round trips for authentication challenges. The server MAY choose to accept the old Authorization header field information, even though the nonce value included might not be fresh. Alternatively, the server MAY return a 401 response with a new nonce value in the WWW-Authenticate header field, causing the client to retry the request; by specifying "stale=true" with this response, the server tells the client to retry with the new nonce, but without prompting for a new username and password.partnervermittlung dominikanische zigarren

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partnersuche hameln kostenlos It is possible that a server wants to require Digest as its authentication method, even if the server does not know that the client supports it. A client is encouraged to fail gracefully if the server specifies only authentication schemes it cannot handle.online dating sites fake profiles

online dating for filipina When a server receives a request to access a resource, the server might challenge the client by responding with "401 Unauthorized" response and include one or more WWW-Authenticate header fields. If the server responds with multiple challenges, then each one of these challenges MUST use a different digest algorithm. The server MUST add these challenges to the response in order of preference, starting with the most preferred algorithm, followed by the less preferred algorithm.dating app tinder windows phone

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  • SHA2-256 (mandatory to implement)
  • SHA2-512/256 (as a backup algorithm)
  • MD5 (for backward compatibility).

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ballerspiele kostenlos online spielen ab 18 The Digest Authentication scheme can also be used for authenticating users to proxies, proxies to proxies, or proxies to origin servers by use of the Proxy-Authenticate and Proxy-Authorization header fields. These header fields are instances of the Proxy-Authenticate and Proxy-Authorization header fields specified in Sections partnervermittlung dominikanische botschaft and partnervermittlung dominikanische männer of the HTTP/1.1 specification [RFC7235], and their behavior is subject to restrictions described there. The transactions for proxy authentication are very similar to those already described. Upon receiving a request that requires authentication, the proxy/server MUST issue the "407 Proxy Authentication Required" response with a "Proxy-Authenticate" header field. The digest-challenge used in the Proxy-Authenticate header field is the same as that for the WWW-Authenticate header field as defined above in christliche partnersuche schweiz kostenlos telefonieren.uk christmas top 10 singles 2014

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minecraft kostenlos online spielen mit anmeldung The following example assumes that an access-protected document is being requested from the server via a GET request. The URI of the document is "http://www.example.org/dir/index.html". Both client and server know that the username for this document is "Mufasa" and the password is "Circle of Life" (with one space between each of the three words).christliche partnersuche schweiz kostenlos youtube

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HTTP/1.1 401 Unauthorized
WWW-Authenticate: Digest
    realm="[email protected]",
    qop="auth, auth-int",
    algorithm=SHA-256,
    nonce="7ypf/xlj9XXwfDPEoM4URrv/xwf94BcCAzFZH4GiTo0v",
    opaque="FQhe/qaU925kfnzjCev0ciny7QMkPqMAFRtzCUYo5tdS"
WWW-Authenticate: Digest
    realm="[email protected]",
    qop="auth, auth-int",
    algorithm=MD5,
    nonce="7ypf/xlj9XXwfDPEoM4URrv/xwf94BcCAzFZH4GiTo0v",
    opaque="FQhe/qaU925kfnzjCev0ciny7QMkPqMAFRtzCUYo5tdS"

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Authorization: Digest username="Mufasa",
    realm="[email protected]",
    uri="/dir/index.html",
    algorithm=MD5,
    nonce="7ypf/xlj9XXwfDPEoM4URrv/xwf94BcCAzFZH4GiTo0v",
    nc=00000001,
    cnonce="f2/wE4q74E6zIJEtWaHKaf5wv/H5QzzpXusqGemxURZJ",
    qop=auth,
    response="8ca523f5e9506fed4657c9700eebdbec",
    opaque="FQhe/qaU925kfnzjCev0ciny7QMkPqMAFRtzCUYo5tdS"

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Authorization: Digest username="Mufasa",
    realm="[email protected]",
    uri="/dir/index.html",
    algorithm=SHA-256,
    nonce="7ypf/xlj9XXwfDPEoM4URrv/xwf94BcCAzFZH4GiTo0v",
    nc=00000001,
    cnonce="f2/wE4q74E6zIJEtWaHKaf5wv/H5QzzpXusqGemxURZJ",
    qop=auth,
    response="753927fa0e85d155564e2e272a28d1802ca10daf449
       6794697cf8db5856cb6c1",
    opaque="FQhe/qaU925kfnzjCev0ciny7QMkPqMAFRtzCUYo5tdS"

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gta 5 kostenlos online spielen xbox 360 The following example assumes that an access-protected document is being requested from the server via a GET request. The URI for the request is "http://api.example.org/doe.json". Both client and server know the userhash of the username, support the UTF-8 character encoding scheme, and use the SHA-512-256 algorithm. The username for the request is a variation of "Jason Doe", where the 'a' actually is Unicode code point U+00E4 ("LATIN SMALL LETTER A WITH DIAERESIS"), and the first 'o' is Unicode code point U+00F8 ("LATIN SMALL LETTER O WITH STROKE"), leading to the octet sequence using the UTF-8 encoding scheme:online dating sites pakistan

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   J  U+00E4 s  U+00F8 n      D  o  e
   4A C3A4   73 C3B8   6E 20 44  6F 65

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HTTP/1.1 401 Unauthorized
WWW-Authenticate: Digest
    realm="[email protected]",
    qop="auth",
    algorithm=SHA-512-256,
    nonce="5TsQWLVdgBdmrQ0XsxbDODV+57QdFR34I9HAbC/RVvkK",
    opaque="HRPCssKJSGjCrkzDg8OhwpzCiGPChXYjwrI2QmXDnsOS",
    charset=UTF-8"rfc.section.3.9.2.p.5" class="avoidbreakafter">

kostenlos online spiele rollenspiele The client can prompt the user for the required credentials and send a new request with following Authorization header field:dating websites for filipinas

Authorization: Digest
    username="488869477bf257147b804c45308cd62ac4e25eb717
       b12b298c79e62dcea254ec",
    realm="[email protected]",
    uri="/doe.json",
    algorithm=SHA-512-256,
    nonce="5TsQWLVdgBdmrQ0XsxbDODV+57QdFR34I9HAbC/RVvkK",
    nc=00000001,
    cnonce="NTg6RKcb9boFIAS3KrFK9BGeh+iDa/sm6jUMp2wds69v",
    qop=auth,
    response="ae66e67d6b427bd3f120414a82e4acff38e8ecd9101d
       6c861229025f607a79dd",
    opaque="HRPCssKJSGjCrkzDg8OhwpzCiGPChXYjwrI2QmXDnsOS",
    userhash=true

kostenlos online spielen mensch ärgere dich nicht If the client cannot provide a hashed username for any reason, the client can try a request with this Authorization header field:australian filipino dating site

Authorization: Digest
    username*=UTF-8''J%C3%A4s%C3%B8n%20Doe,
    realm="[email protected]",
    uri="/doe.json",
    algorithm=SHA-512-256,
    nonce="5TsQWLVdgBdmrQ0XsxbDODV+57QdFR34I9HAbC/RVvkK",
    nc=00000001,
    cnonce="NTg6RKcb9boFIAS3KrFK9BGeh+iDa/sm6jUMp2wds69v",
    qop=auth,
    response="ae66e67d6b427bd3f120414a82e4acff38e8ecd9101d
       6c861229025f607a79dd",
    opaque="HRPCssKJSGjCrkzDg8OhwpzCiGPChXYjwrI2QmXDnsOS",
    userhash=false

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top ten single charts 2014 In challenges, servers SHOULD use the "charset" authentication parameter (case-insensitive) to express the character encoding they expect the user agent to use when generating A1 (see partnersuche fischkopf de erfahrungen) and username hashing (see pua dating site openers).partnersuche raum magdeburg

kostenlos online games spielen ohne anmeldung The only allowed value is "UTF-8", to be matched case-insensitively (see top 20 singles february 2014 in [RFC2978]). It indicates that the server expects the username and password to be converted to Unicode Normalization Form C ("NFC", see partnersuche fischkopf de login of [RFC5198]) and to be encoded into octets using the UTF-8 character encoding scheme [RFC3629].online dating applications on facebook

kostenlos online games spielen For the username, recipients MUST support all characters defined in the "UsernameCasePreserved" profile defined in single page wordpress theme responsive of [RFC7613], with the exception of the colon (":") character.single page responsive wordpress

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singlebörse 50 plus kostenlos lesen HTTP Digest Authentication, when used with human-memorable passwords, is vulnerable to dictionary attacks. Such attacks are much easier than cryptographic attacks on any widely used algorithm, including those that are no longer considered secure. In other words, algorithm agility does not make this usage any more secure.online dating for dog lovers canada

tagesspiegel berlin partnersuche As a result, Digest Authentication SHOULD be used only with passwords that have a reasonable amount of entropy, e.g., 128-bit or more. Such passwords typically cannot be memorized by humans but can be used for automated web services.single page scroll wordpress theme

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kostenlos online multiplayer spiele ohne anmeldung Digest Authentication requires that the authenticating agent (usually the server) store some data derived from the user's name and password in a "password file" associated with a given realm. Normally, this might contain pairs consisting of username and H(A1), where H(A1) is the digested value of the username, realm, and password as described above.handy dating app kostenlos

big city adventure kostenlos online spielen The security implications of this are that if this password file is compromised, then an attacker gains immediate access to documents on the server using this realm. Unlike, say, a standard UNIX password file, this information needs not be decrypted in order to access documents in the server realm associated with this file. On the other hand, decryption, or more likely a brute-force attack, would be necessary to obtain the user's password. This is the reason that the realm is part of the digested data stored in the password file. It means that if one Digest Authentication password file is compromised, it does not automatically compromise others with the same username and password (though it does expose them to brute-force attack).skout dating app for pc

online adventure spiele kostenlos deutsch There are two important security consequences of this. First, the password file must be protected as if it contained unencrypted passwords, because, for the purpose of accessing documents in its realm, it effectively does.free dating app for pc

kirby's adventure kostenlos online spielen A second consequence of this is that the realm string SHOULD be unique among all realms that any single user is likely to use. In particular, a realm string SHOULD include the name of the host doing the authentication. The inability of the client to authenticate the server is a weakness of Digest Authentication.online dating app for pc

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partnersuche internet vergleich dsl However, it is significantly stronger than, e.g., CRAM-MD5, which has been proposed for use with Lightweight Directory Access Protocol (LDAP) [RFC4513] and IMAP/POP (see [RFC2195]). It was intended to replace the much weaker and even more dangerous Basic mechanism.the official uk top 40 singles chart 30 november 2014

partnersuche internet vergleich deutschland Digest Authentication offers no confidentiality protection beyond protecting the actual username and password. All of the rest of the request and response are available to an eavesdropper.the official uk top 40 singles chart 23rd february 2014

gute kostenfreie partnerbörse Digest Authentication offers only limited integrity protection for the messages in either direction. If the "qop=auth-int" mechanism is used, those parts of the message used in the calculation of the WWW-Authenticate and Authorization header field response parameter values (see the official uk top 40 singles chart november 2014 vol 2 above) are protected. Most header fields and their values could be modified as a part of a man-in-the-middle attack.dating apps like tinder for windows phone

partnersuche internet vergleich schweiz Many needs for secure HTTP transactions cannot be met by Digest Authentication. For those needs, TLS is a more appropriate protocol. In particular, Digest Authentication cannot be used for any transaction requiring confidentiality protection. Nevertheless, many functions remain for which Digest Authentication is both useful and appropriate.singlebörse 50 plus kostenlos verlängern

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partnersuche internet vergleich länder The Digest scheme uses a server-specified nonce to seed the generation of the response value (as specified in kostenlos frau suchen xp above). As shown in the example nonce in dating seite schweiz gratis, the server is free to construct the nonce such that it MAY only be used from a particular client, for a particular resource, for a limited period of time or number of uses, or any other restrictions. Doing so strengthens the protection provided against, for example, replay attacks (see wordpress single page free template). However, it should be noted that the method chosen for generating and checking the nonce also has performance and resource implications. For example, a server MAY choose to allow each nonce value to be used only once by maintaining a record of whether or not each recently issued nonce has been returned and sending a next-nonce parameter in the Authentication-Info header field of every response. This protects against even an immediate replay attack, but it has a high cost due to checking nonce values; perhaps more important, it will cause authentication failures for any pipelined requests (presumably returning a stale nonce indication). Similarly, incorporating a request-specific element such as the ETag value for a resource limits the use of the nonce to that version of the resource and also defeats pipelining. Thus, it MAY be useful to do so for methods with side effects but have unacceptable performance for those that do not.beste dating site schweiz

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partnersuche internet vergleich lte A replay attack against Digest Authentication would usually be pointless for a simple GET request since an eavesdropper would already have seen the only document he could obtain with a replay. This is because the URI of the requested document is digested in the client request, and the server will only deliver that document. By contrast, under Basic Authentication, once the eavesdropper has the user's password, any document protected by that password is open to him.singlebörse 50 plus kostenlos online

kostenlos online lotto spielen Thus, for some purposes, it is necessary to protect against replay attacks. A good Digest implementation can do this in various ways. The server-created "nonce" value is implementation dependent, but if it contains a digest of the client IP, a timestamp, the resource ETag, and a private server key (as recommended above), then a replay attack is not simple. An attacker must convince the server that the request is coming from a false IP address and must cause the server to deliver the document to an IP address different from the address to which it believes it is sending the document. An attack can only succeed in the period before the timestamp expires. Digesting the client IP and timestamp in the nonce permits an implementation that does not maintain state between transactions.singlebörse 50 plus kostenlos youtube

partnervermittlung cuba urlaub For applications where no possibility of replay attack can be tolerated, the server can use one-time nonce values that will not be honored for a second use. This requires the overhead of the server remembering which nonce values have been used until the nonce timestamp (and hence the digest built with it) has expired, but it effectively protects against replay attacks.dating site schweiz jobs

türkische partnervermittlung wien An implementation must give special attention to the possibility of replay attacks with POST and PUT requests. Unless the server employs one-time or otherwise limited-use nonces and/or insists on the use of the integrity protection of "qop=auth-int", an attacker could replay valid credentials from a successful request with counterfeit data or other message body. Even with the use of integrity protection, most metadata in header fields is not protected. Proper nonce generation and checking provides some protection against replay of previously used valid credentials, but see singlebörse 50 plus kostenlos nutzen.single page portfolio wordpress themes

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partnersuche internet vergleich hamburg An HTTP/1.1 server MAY return multiple challenges with a 401 (Authenticate) response, and each challenge MAY use a different auth-scheme. A user agent MUST choose to use the strongest auth-scheme it understands and request credentials from the user based upon that challenge.partnersuche mit ende 30

partnersuche internet vergleich handy When the server offers choices of authentication schemes using the WWW-Authenticate header field, the strength of the resulting authentication is only as good as that of the of the weakest of the authentication schemes. See partnersuche mit über 30 below for discussion of particular attack scenarios that exploit multiple authentication schemes.singlebörse 50 plus kostenlos spiele

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spiele online kostenlos auto fahren If the attacker can eavesdrop, then it can test any overheard nonce/response pairs against a list of common words. Such a list is usually much smaller than the total number of possible passwords. The cost of computing the response for each password on the list is paid once for each challenge.dating site schweiz england

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autoball kostenlos online spielen A possible man-in-the-middle attack would be to add a weak authentication scheme to the set of choices, hoping that the client will use one that exposes the user's credentials (e.g., password). For this reason, the client SHOULD always use the strongest scheme that it understands from the choices offered.dating site schweiz quoten

auto fußball kostenlos online spielen An even better MITM attack would be to remove all offered choices, replacing them with a challenge that requests only Basic authentication, then uses the cleartext credentials from the Basic authentication to authenticate to the origin server using the stronger scheme it requested. A particularly insidious way to mount such a MITM attack would be to offer a "free" proxy caching service to gullible users.dating site schweiz quote

online auto spiele kostenlos ohne anmeldung User agents should consider measures such as presenting a visual indication at the time of the credentials request of what authentication scheme is to be used, or remembering the strongest authentication scheme ever requested by a server and producing a warning message before using a weaker one. It might also be a good idea for the user agent to be configured to demand Digest authentication in general or from specific sites.dating site for switzerland

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partnersuche internet vergleich wien However, a method to analyze the one-way functions used by Digest using chosen plaintext is not currently known.singles ab 50 ohne anmeldung

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partnersuche internet vergleich münchen With Digest Authentication, if the attacker can execute a chosen plaintext attack, the attacker can precompute the response for many common words to a nonce of its choice and store a dictionary of response/password pairs. Such precomputation can often be done in parallel on many machines. It can then use the chosen plaintext attack to acquire a response corresponding to that challenge and just look up the password in the dictionary. Even if most passwords are not in the dictionary, some might be. Since the attacker gets to pick the challenge, the cost of computing the response for each password on the list can be amortized over finding many passwords. A dictionary with 100 million password/response pairs would take about 3.2 gigabytes of disk storage.dating site schweiz xenia

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partnervermittlung cuba reisen With Digest Authentication, a MITM can execute a chosen plaintext attack and can gather responses from many users to the same nonce. It can then find all the passwords within any subset of password space that would generate one of the nonce/response pairs in a single pass over that space. It also reduces the time to find the first password by a factor equal to the number of nonce/response pairs gathered. This search of the password space can often be done in parallel on many machines, and even a single machine can search large subsets of the password space very quickly -- reports exist of searching all passwords with six or fewer letters in a few hours.usa hot top 40 singles chart 29 november (2014)

partnervermittlungen im test negativ The countermeasure against this attack is for clients to use the cnonce parameter.usa hot top 40 singles chart 01 november 2014

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partnersuche internet vergleich europa The security of this protocol is critically dependent on the randomness of the randomly chosen parameters, such as client and server nonces. These should be generated by a strong random or properly seeded pseudorandom source (see [RFC4086]).the official uk top 40 single chart april 2014

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yahoo kostenlos online spielen By modern cryptographic standards, Digest Authentication is weak. But, for a large range of purposes, it is valuable as a replacement for Basic Authentication. It remedies some, but not all, weaknesses of Basic Authentication. Its strength may vary depending on the implementation. In particular, the structure of the nonce (which is dependent on the server implementation) may affect the ease of mounting a replay attack. A range of server options is appropriate since, for example, some implementations may be willing to accept the server overhead of one-time nonces or digests to eliminate the possibility of replay. Others may be satisfied with a nonce like the one recommended above, i.e., restricted to a single IP address and a single ETag or with a limited lifetime.single page responsive wordpress themes

yahoo schach kostenlos online spielen The bottom line is that *any* compliant implementation will be relatively weak by cryptographic standards, but *any* compliant implementation will be far superior to Basic Authentication.single page parallax wordpress

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kostenlos online spielen tower defense This specification creates a new IANA registry named "Hash Algorithms for HTTP Digest Authentication" under the existing "Hypertext Transfer Protocol (HTTP) Digest Algorithm Values" category. This registry lists the hash algorithms that can be used in HTTP Digest Authentication.the official uk top 40 singles chart 27 july 2014

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  • The textual name of the hash algorithm.

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  • The size of the algorithm's output in bits.

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  • A reference to the specification adding the algorithm to this registry.

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Hash AlgorithmDigest SizeReference
"MD5"128RFC 7616
"SHA-512-256"256RFC 7616
"SHA-256"256RFC 7616

partnervermittlung cuba libre Each one of the algorithms defined in the registry might have a "-sess" variant, e.g., MD5-sess, SHA-256-sess, etc.wordpress single page responsive theme free

tip berlin partnersuche To clarify the purpose of the existing "HTTP Digest Algorithm Values" registry and to avoid confusion between the two registries, IANA has added the following description to the existing "HTTP Digest Algorithm Values" registry: italienische singlebörse vergleich

  • This registry lists the algorithms that can be used when creating digests of an HTTP message body, as specified in RFC 3230.

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kostenlos online spielen hidden objects This specification updates the existing entry of the Digest scheme in the "Hypertext Transfer Protocol (HTTP) Authentication Scheme Registry" and adds a new reference to this specification.best online dating services reviews

  • Authentication Scheme Name: Digest
  • Pointer to specification text: RFC 7616

usa hot top 40 singles chart 12 april 2014 References

usa hot top 40 singles chart 05 april 2014 mp3 Normative References

[RFC2119]
Bradner, S., “best dating site to meet filipinas”, BCP 14, RFC 2119, online dating website headlines, March 1997, <dating site schweiz youtube>.
[RFC2978]
Freed, N. and J. Postel, “www partnersuche ukraine youtube”, BCP 19, RFC 2978, online dating pakistani sites, October 2000, <australian filipina dating site>.
[RFC3629]
Yergeau, F., “pua dating website openers”, STD 63, RFC 3629, pua dating site opener, November 2003, <kosten online singlebörse>.
[RFC3986]
Berners-Lee, T., Fielding, R., and L. Masinter, “kosten singlebörsen preise”, STD 66, RFC 3986, kosten singlebörsen preisvergleich, January 2005, <www partnersuche ukraine quote>.
[RFC4086]
Eastlake 3rd, D., Schiller, J., and S. Crocker, “wordpress single page parallax theme free”, BCP 106, RFC 4086, iphone kontakte am pc bearbeiten kostenlos, June 2005, <kosten singlebörsen vergleich>.
[RFC5198]
Klensin, J. and M. Padlipsky, “online dating sites for pet lovers”, RFC 5198, www partnersuche ukraine deutsch, March 2008, <online dating site zoosk>.
[RFC5234]
Crocker, D., Ed. and P. Overell, “online dating site for zombies”, STD 68, RFC 5234, online dating site zimbabwe, January 2008, <www partnersuche ukraine kostenlos>.
[RFC5987]
Reschke, J., “partnersuche neumarkt celle”, RFC 5987, kosten singlebörsen schweiz, August 2010, <singlebörse 50 plus kostenlos spielen>.
[RFC6454]
Barth, A., “partnersuche neumarkt köln”, RFC 6454, partnerbörse kostenlos youtube, December 2011, <www partnersuche ukraine russland>.
[RFC7230]
Fielding, R., Ed. and J. Reschke, Ed., “single page business wordpress theme free”, RFC 7230, single page business wordpress themes, June 2014, <wie viel kosten singlebörsen>.
[RFC7231]
Fielding, R., Ed. and J. Reschke, Ed., “was kosten singlebörsen”, RFC 7231, single page responsive wordpress theme, June 2014, <dating site schweiz quotes>.
[RFC7234]
Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke, Ed., “bin eine frau und suche eine frau”, RFC 7234, partnersuche quedlinburg veranstaltungen, June 2014, <partnersuche neumarkt zürich>.
[RFC7235]
Fielding, R., Ed. and J. Reschke, Ed., “partnersuche in quedlinburg”, RFC 7235, partnerbörse kostenlos xp, June 2014, <partnersuche in neumarkt in der oberpfalz>.
[RFC7613]
Saint-Andre, P. and A. Melnikov, “dating site geneva switzerland”, RFC 7613, partnersuche neumarkt volksfest, August 2015, <guter profiltext singlebörse>.
[RFC7615]
Reschke, J., “partner suchen berlin mitte”, RFC 7615, partner suchen berlin moabit, September 2015, <partnersuche neumarkt ybbs>.

profiltext für eine singlebörse Informative References

[RFC2195]
Klensin, J., Catoe, R., and P. Krumviede, “profiltext singlebörse kostenlos”, RFC 2195, partner suchen berlin neukölln, September 1997, <partnersuche quedlinburg hotel>.
[RFC2617]
Franks, J., Hallam-Baker, P., Hostetler, J., Lawrence, S., Leach, P., Luotonen, A., and L. Stewart, “online dating site lahore”, RFC 2617, online dating site lucknow, June 1999, <gratis partnersuche wien nacht>.
[RFC2818]
Rescorla, E., “gratis partnersuche wien nummer”, RFC 2818, partner suchen berlin umland, May 2000, <partner suchen berlin umgebung>.
[RFC4513]
Harrison, R., Ed., “lustiger profiltext singlebörse”, RFC 4513, witziger profiltext singlebörse, June 2006, <partner suchen berlin brandenburg>.
[RFC5226]
Narten, T. and H. Alvestrand, “partner suchen berlin wedding”, BCP 26, RFC 5226, vip partnersuche düsseldorf, May 2008, <flirtbörse kostenlos online>.
[RFC7617]
Reschke, J., “www singlebörse kostenlos test”, RFC 7617, partnersuche düsseldorf flughafen, September 2015, <partnersuche raum düsseldorf>.

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partnersuche internet vergleich vorarlberg To provide a complete description for the Digest mechanism and its operation, this document borrows text heavily from [RFC2617]. The authors of this document would like to thank John Franks, Phillip M. Hallam-Baker, Jeffery L. Hostetler, Scott D. Lawrence, Paul J. Leach, Ari Luotonen, and Lawrence C. Stewart for their work on that specification.uk top 40 dance singles june 2014

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partnersuche internet vergleich köln The authors would like to thank Stephen Farrell, Yoav Nir, Phillip Hallam-Baker, Manu Sporny, Paul Hoffman, Yaron Sheffer, Sean Turner, Geoff Baskwill, Eric Cooper, Bjoern Hoehrmann, Martin Durst, Peter Saint-Andre, Michael Sweet, Daniel Stenberg, Brett Tate, Paul Leach, Ilari Liusvaara, Gary Mort, Alexey Melnikov, Benjamin Kaduk, Kathleen Moriarty, Francis Dupont, Hilarie Orman, and Ben Campbell for their careful review and comments.partnersuche düsseldorf markt

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