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I need to know some simple encryption algorithms. I need at least 10 algorithms to demonstrate basic cryptology. I’m going to implement it in a program (that should be my problem).
What I want is just the algorithm, very simple ones more like the level of simplicity in the ROT13 algorithm (this is not included).
You can adapt classical algorithms to use bytes instead of letters: Caesar, Monoalphabetic substitution, Vigenère, Playfair, Four Square for example. The extension from 26 (or 36) characters to 256 byte values is pretty much obvious in those cases.
The One Time Pad (i.e. XOR) is extremely simple to program.
Of the modern computer cyphers only RC4 could really be described as simple to program.