This programm implements the Playfair Cipher, a symmetric encryption technique that encrypts pairs of letters, in Java. The program demonstrates both encryption and decryption of plaintext using a key ...

The Playfair cipher is an incredibLe code system that is both difficult to decrypt without a computer and easily solvable by hand. You might be familiar with the Cryptoquip in the comics section ...

How to Encrypt and Decrypt. This program uses the Caesar Cipher algorithm, which we discussed last month.As a review, this cipher works by shifting each letter by 0 to 25 times.