To implement a program to encrypt a plain text and decrypt a cipher text using play fair Cipher substitution technique. The Playfair cipher uses a 5 by 5 table containing a key word or phrase. To ...

To implement a program to encrypt a plain text and decrypt a cipher text using play fair Cipher substitution technique. Testing algorithm with different key values. ALGORITHM DESCRIPTION: The Playfair ...

The Double Playfair is an extension of the Playfair to use two separate keys and to encipher each pair of letters twice. The German police made the mistake in late 1941 of switching from the rather ...