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replay attack prevention

843811Mar 27 2005 — edited Apr 3 2005

What's the best way to implement replay attack prevention in an MSN like chat application? All messages are already encrypted and MAC authenticated.

I was thinking sequence numbers but that's vulnurable to delay attacks.

Or maybe a timestamp but how to you synch the clocks of the two parties?

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Locked on May 1 2005

Added on Mar 27 2005

#cryptography

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