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MS-CHAP

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MS-CHAP
[ temporary import ]
please note:
- the content below is remote from Wikipedia
- it has been imported raw for GetWiki
MS-CHAP is the Microsoft version of the Challenge-Handshake Authentication Protocol, CHAP. The protocol exists in two versions, MS-CHAPv1 (defined in RFC 2433) and MS-CHAPv2 (defined in RFC 2759). MS-CHAPv2 was introduced with Windows NT 4.0 SP4 and was added to Windows 98 in the "Windows 98 Dial-Up Networking Security Upgrade Release"WEB, Windows 98 Dial-Up Networking Security Upgrade Release Notes (August 1998),weblink Support, Microsoft, August 1998, and Windows 95 in the "Dial Up Networking 1.3 Performance & Security Update for MS Windows 95" upgrade. Windows Vista dropped support for MS-CHAPv1.MS-CHAP is used as one authentication option in Microsoft's implementation of the PPTP protocol for virtual private networks. It is also used as an authentication option with RADIUSIETF, 2548, Microsoft Vendor-specific RADIUS Attributes, servers which are used with IEEE 802.1X (e.g., WiFi security using the WPA-Enterprise protocol). It is further used as the main authentication option of the Protected Extensible Authentication Protocol (PEAP).Compared with CHAP,IETF, 1994, PPP Challenge Handshake Authentication Protocol (CHAP), MS-CHAP:IETF, 2433, Microsoft PPP CHAP Extensions, IETF, 2759, Microsoft PPP CHAP Extensions, Version 2,
  • is enabled by negotiating CHAP Algorithm 0x80 (0x81 for MS-CHAPv2) in LCP option 3, Authentication Protocol
  • provides an authenticator-controlled password change mechanism
  • provides an authenticator-controlled authentication retry mechanism
  • defines failure codes returned in the Failure packet message field
MS-CHAPv2 provides mutual authentication between peers by piggybacking a peer challenge on the Response packet and an authenticator response on the Success packet.

Cryptanalysis

Several weaknesses have been identified in MS-CHAP and MS-CHAPv2WEB,weblink Cryptanalysis of Microsoft's PPTP Authentication Extensions (MS-CHAPv2), Bruce, Schneier, Bruce Schneier, Mudge, David, Wagner, schneier.com, 19 October 1999, PDF, . The DES encryption used in NTLMv1 to encrypt the NTLM password hash make custom hardware attacks utilizing the method of brute force feasible. In 2012 the complexity of breaking MS-CHAPv2 has been reduced to that of breaking a single 56-bit DES key encryptionWEB,weblink Exploiting known security holes in Microsoft's PPTP Authentication Extensions (MS-CHAPv2), Jochen, Eisinger, 23 July 2001, penguin-breeder.org, .

See also

References

{{Reflist|30em}}{{Authentication APIs}}

- content above as imported from Wikipedia
- "MS-CHAP" does not exist on GetWiki (yet)
- time: 9:08am EDT - Mon, Oct 15 2018
[ this remote article is provided by Wikipedia ]
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