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.
DES: http://orlingrabbe.com/des.htm You could class triple DES as it's own algorithm too.
AES - http://www.scribd.com/api_user_11797_Tanmoy%20Sen%20Gupta/d/7107279-The-AES-Algorithm
Blowfish - www.schneier.com/blowfish-download.html
A very basic Xor is a possibility too if you run out of ideas.
You mentioned that AES and DES are too difficult to implement. But these are not encryption algorithms -- they are blockciphers, and are fairly useless by themselves. Modern encryption algorithms are typically built on top of blockciphers.
If your instructor let's you use someone else's AES implementation, you can use it to build a variety of encryption algorithms, such as counter mode or cipher-block chaining. These algorithms should be fairly straight-forward to implement.
See http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation for some examples.
You can refer this book "the codebook by Simon Singh". It will help you to understand encryption algorithms easily. you can download it here. http://simonsingh.net/cryptography/crypto-cd-rom/
