17 Dec
2003
17 Dec
'03
11:17 p.m.
Folks, As this sounds like a previously solved problem, I wanted to find out about using DES (or any block cipher) as a stream cipher, i.e., in a manner that keeps input and output data length equal. I don't want to use a true stream cipher, as I want to use the same key for multiple messages and stream ciphers tend to place the bulk of their overhead in the re-key. Since stream ciphers have "memory," I would have to "re-key" to the same key for each of my messages. I would rather key something like DES once and run it in CBC mode or use some other form of IV. Help or pointers to help are greatly appreciated. Karl