David Johnston wrote:
> Jon Callas wrote:
>> Moreover, AES-256 is 20-ish percent slower than AES-128. 
> Compared to AES-128, AES-256 is 140% of the rounds to encrypt 200% as
> much data. So when implemented in hardware, AES-256 is substantially
> faster.

AES-256 does not encrypt any more data per round than AES-128.

My guess is that you are thinking about Rijndael with a 256 bit block
and a 256 bit key.

  Brian Gladman

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