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The protocol exists in two versions, MS-CHAPv1 (defined in RFC 2433) and MS-CHAPv2 (defined in RFC 2759).MS-CHAPv2 was introduced with pptp3-fix that was included in Windows NT 4.0 SP4 and was added to Windows 98 in the "Windows 98 Dial-Up Networking Security Upgrade Release" [1] and Windows 95 in the "Dial Up Networking 1.3 Performance & Security Update for MS Windows 95" upgrade.
MS-CHAP-v2 is vulnerable to dictionary attacks on the captured challenge response packets. Tools exist to perform this process rapidly. [8] In 2012, it was demonstrated that the complexity of a brute-force attack on a MS-CHAP-v2 key is equivalent to a brute-force attack on a single DES key. An online service was also demonstrated which is ...
Microsoft Wireless Zero Configuration [10] Microsoft October 25, 2001 (with Windows XP) PEAP-ELS, PEAP-MS-CHAP v2 WEP, WPA,WPA2 ver Free Windows XP, Windows Server 2003: none Desktop, Workstation, Server, Windows users Dell Wireless LAN Card Utility [11] Dell N/A N/A WEP, WPA,WPA2 ver 3.0 Free Windows Only for Cisco Aironet products Desktop ...
MS-CHAPv2 is an old authentication protocol which Microsoft introduced with NT4.0 SP4 and Windows 98. PEAPv0/EAP-MSCHAPv2 is the most common form of PEAP in use, and what is usually referred to as PEAP.
In computing, the Challenge-Handshake Authentication Protocol (CHAP) is an authentication protocol originally used by Point-to-Point Protocol (PPP) to validate users. CHAP is also carried in other authentication protocols such as RADIUS and Diameter. Almost all network operating systems support PPP with CHAP, as do most network access servers.
In this case, the same RADIUS server is used for both PEAP authentication for joining the network and MS-CHAP v2 authentication to log into the domain. A bootstrap wireless profile can also be created on the wireless client, which first authenticates the computer to the wireless network and joins the network.