I would like to know will CHAP perform a re-challenge of the hash value after a peroid of time?
For example, initially the link up after the first authentication...Will it perform a periodic challenge? If yes, how long is it?
RFC 1994 states as below :
Challenge-Handshake Authentication Protocol
The Challenge-Handshake Authentication Protocol (CHAP) is used to
periodically verify the identity of the peer using a 3-way handshake.
This is done upon initial link establishment, and MAY be repeated
anytime after the link has been established.
1. After the Link Establishment phase is complete, the
authenticator sends a "challenge" message to the peer.
2. The peer responds with a value calculated using a "one-way
3. The authenticator checks the response against its own
calculation of the expected hash value. If the values match,
the authentication is acknowledged; otherwise the connection
SHOULD be terminated.
4. At random intervals, the authenticator sends a new challenge to
the peer, and repeats steps 1 to 3
But it doesnt specifies the time interval it says random intervals...
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