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RE: Generating 3DES keys from SKEYID_e
>>>>> "Glawitsch," == Glawitsch, Gregor <Gregor_Glawitsch@nai.com> writes:
Glawitsch,> Stephane, do you realize how large 2^128 is?
While it doesn't matter for 3DES (since the effective key strength is
less than 2^128) this issue will matter for AES.
Yes, 2^128 is a big number. But if you want to claim support for
ciphers with long keys, by his argument you need a PRF of
corresponding size. There's something to be said for that.
The alternative, of course, is not to support keys larger than 128
bits. That's in practice not a bad idea.
paul
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