Hey, I was just wondering if there was a technical name for a cipher that is sort of 'composed' of a bunch of other ciphers.
For instance, if you have cipher A, B, C, you could encript the plain text D with A, then encrypt that cipher text with B, then encrypt that with C, and so on.
I'm not really sure how difficult these types of ciphers would be to break. I came up with the idea of a composition cipher while I was in the shower, and, once I write a program for it, I might post an example in the puzzle section, provided that people would be interested in trying it out. Of course, the text would be sufficently long as to make it conceivable to break.
Also, I was wondering if anyone knew of any good introductory books to the subject of cryptography-not cryptanalysis (although that would be great too), but cryptography.