Monday, June 04, 2007

Long key cipher

Does Rijndael and AES become less secure if you amputate the key expansion/key schedule step and simply replace it with a long key of appropriate length?

Suppose we wished to use a very long keyed cipher. The idea is even if the adversary were to get access to the key, it would be very awkward to transport or transmit it: a key gigabytes or terabytes in size.

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