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Sequence Number for streaming ciphers?



>Date: Fri, 11 Jul 97 12:28:52 GMT
>From: "William Allen Simpson" <wsimpson@greendragon.com>

>This
>   field protects against replay attacks, and may also be used for syn-
>   chronization by stream or block-chaining ciphers.

What experience is being referenced about the sequence number being used
for synchronization by stream ciphers?