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RE: Two AES encryption modes?

Scott:

Thanks for updating your analysis.

>Speed of Software Implementation:
>
>Both transforms can be executed in approximately the same speed.
>However, both CBC and COUNTER also require authentication transforms to
>be executed.

In this area, I think that it is worth pointing out that the COUNTER key 
stream can be precomputed (at least on the encryptor side).  While 
authentication must be performed when the packet is available, the key 
stream can be precomputed to allow for reduced latency.

Russ