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Sep
12
comment How practical are side-channel attacks and how much of a concern are they?
This is an interesting question but I'm not sure it has a correct answer. Sounds like a great topic for a discussion thread.
Aug
30
comment Use of nonces in Kerberos and Needham–Schroeder protocols
To elaborate, as @Matteo mentioned, freshness is important not just for messages, but also for keys; if you use the above technique to, say, get a fresh key from a key server, you know that for the duration of the session that the key hasn't been compromised using cryptographic methods (again assuming some reasonable things about how long it takes to compromise a key using cryptographic methods relative to your session timeout).
Aug
30
awarded  Supporter
Aug
30
comment Use of nonces in Kerberos and Needham–Schroeder protocols
I'd say that nonces could indicate their own sort of purely local notion freshness (given reasonable assumptions about what it means to be a nonce). For example when an initiator generates a nonce in a particular session, and in the same session receives a cyphertext containing the nonce and some other stuff securely signed by the responder, the initiator can be reasonably certain that the cyphertext was securely signed by the responder in a recent run.
Aug
30
awarded  Autobiographer