Mike Rosing[SMTP:eresrch@eskimo.com]

Forwarded by request.

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sector address as the IV. IVs don't need to be random, secret, or unpredictable - they just need to be unrepeated. (I'm assuming sector-at-a- time encryption).

If the IV is not a secret how are we going to prevent block replay attacks on cipher text?

Regards Sarath.

This isn't a communications protocol. We're talking about disk storage. The only circumstances where an attacker could use this as an attack vector would be if the attacker could take multiple snapshots of the disk, possibly replacing blocks at later times. Peter