On Sun, 3 Dec 2006, David Johnston 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 means AES with 128-bit block and 256-bit key, so AES-256
encrypts the same amount of data as AES-128.

As of hardware implementation, one can use several engines in
parallel, although even a single one can be faster than needed,
for example, with 280 MHz there are 2e7 blocks per second, that is
320 Mbyte per second.


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