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12-29-2006
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Password-based challenge-response
Hello all,
I have this question, hope to get some guidance... Fora simple password-based challenge-response protocol between a user A and a server S, where Pa is A's password, n is a random nonce generated by the server, and h is a known cryptographic hash function. 1. S -> A: E(Pa,n) 2. A -> S: E(Pa,h(n)) How to show that this protocol is vulnerable to an off-line password guessing attack? and how would the attack take place ?. Under which circumstances would the vulnerability not be a problem? thanks for reading... cheers. 
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