Cryptography

This repo contains some algorithms for encryption and decryption of some famous cryptographic methods.

Vigenere:

This directory contains algorithms of encryption and decryption of vigenere cipher.

• There also methods for estimating the length of the key and a rough estimation of the key. Friedmen vigenere gives a estimate of the key length.

ROT13

This directory contains algorithm for encrypting and decrypting of plain text using rot13 method.

• It takes a letter a replaces it with the 13th letter from that position.

• The algorithm for encrypting the plain text and decrypting the cipher both are same.

• It is a form of ceaser cipher with a shift equal to 13.

ROT stands for Rotate by 13 places