Sequence number has its own problems. Message sources have to remember sequence numbers even when it reboots or crashes. Message verifiers have to keep states too, and whenever the states go wrong due to attack or random errors, it's hard to detect and fix them.
Best Regards, Xin Liu On 9/18/07, Bora Akyol <[EMAIL PROTECTED]> wrote: > You can check freshness of a message by means of sequence numbers, no? > > Bora
