Cryptographic Algorithms in Python

Following algorithms have been implemented:

Cyphers

1. Data Encryption Standard (DES) : https://en.wikipedia.org/wiki/Data_Encryption_Standard
2. RC4 : https://en.wikipedia.org/wiki/RC4
3. RSA : https://simple.wikipedia.org/wiki/RSA_(algorithm)
4. Vernam cipher : http://www.pro-technix.com/information/crypto/pages/vernam_base.html
5. Vigenère cipher : https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher

Modular arithmetic

1. Modular multiplicative inverse : https://en.wikipedia.org/wiki/Modular_multiplicative_inverse