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*To*: cypherpunks*Subject*: Re: DES Question*From*: [email protected] ([email protected] +1-510-484-6204)*Date*: Tue, 1 Mar 94 17:07:16 EST*Sender*: [email protected]

Matthew Ghio writes: > When using DES to encrypt email addresses, the total amount of data to > be encrypted would be only 3 or 4 eight-byte DES blocks. My question > is: Would CBC or CFB really be effective for such a small amount of data Assuming you're using a random initialization vector rather than zeros, yes, CBC or CFB should be quite effective - the first real block is essentially XORed with random junk, though of course if they guess the right key they can check that the block comes out reasonably. But it does prevent a brute-force attack where they decrypt and see if they get ASCII, since they first block is random junk - they're forced to decrypt at least two blocks of data, which is somewhat annoying for brute-force-search machines. Bill

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