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can easily determine the remote access client's password. PAP offers no
protection against replay attacks, remote client impersonation, or remote
server impersonation.
Support Challenge Handshake Authentication (CHAP) The Challenge Hand-
shake Authentication Protocol (CHAP) is a challenge-response authenti-
cation protocol that uses MD5 to hash the response to a challenge. CHAP
protects against replay attacks by using an arbitrary challenge string per
authentication attempt.
Support Microsoft CHAP Select this check box if you are communicating with
a peer that uses Microsoft CHAP authentication protocol.
Support Microsoft CHAP Version 2 Select this check box if you are commu-
nicating with a peer that uses Microsoft CHAP Version 2 authentication
protocol.
4.5.3.4 PPP Encryption
PPP supports encryption facilities to secure the data across the network con-
nection. A wide variety of encryption methods may be negotiated, although
typically only one method is used in each direction of the link.
Please note that PPP encryption can only be used with MS-CHAP or MS-CHAP-
V2 authentication algorithms.
Require encryption Select this check box to ensure that the PPP connection is
encrypted.
Support encryption (40 Bit Keys) Select this check box if your peer supports
40 bit encryption keys.
Support maximum strength encryption (128 Bit Keys) Select this check box
if your peer supports 128 bit encryption keys.
4.5.3.5 Internet Protocol
Select one of the following Internet protocol options from the Internet protocol
drop down menu:
• Obtain an IP address automatically
• Use the following IP address
Figure 4.81: PPP Encryption
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