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Re: Bellovin's and Ashar's attacks
The implementation scenarios where this might be problematic
is if there is crypto-hardware where key setup may take
a while. Also, this is problematic if the cipher has
a naturally long key-setup overhead. This isn't the case
for a software implementation of DES-CBC.
Actually, DES key setup in hardware is fast; at least one high-speed
implementation (the Digital gigabit/second chip) can do it at line speed
or better. Caching large numbers of keys is more problematic for many
hardware implementations.
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