Hot answers tagged key-exchange
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CRAM-MD5 is a protocol to demonstrate knowledge of a password. In the context of email, it is sometime used by an email client to authenticate to a POP, IMAP, or/and SMTP server. Basically, the password is used as the key of HMAC-MD5 in a challenge-response protocol.
Among positive things there are to say about CRAM-MD5:
The password is not exchanged in ...
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Fair exchange protocols aren't new by any means, but there is a lack of layman-friendly material out there, unfortunately. I think the high prevalence of theoretical cryptography in fair exchange protocols may be partially responsible for that.
At any rate, here is the basic idea behind a fair exchange protocol. Suppose you have two parties, Alice and Bob, ...
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