A simple command-line utility that implements the Playfair Cipher in C. This is the cipher that was used by JFK aboard PT-109 in WW2.

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 ...

In 1854, Sir Charles Wheatstone invented the cipher known as "Playfair," named for his friend Lyon Playfair, first Baron Playfair of St. Andrews, who popularized and promoted the cipher. Its ...

The Playfair cipher starts with creating a key table. The key table is a 5×5 grid of letters that will act as the key for encrypting your plaintext. Each of the 25 letters must be unique and one ...

Abstract: Transmission of information plays a vital role in the world. Now-a-days, at a given point of time, two people are transmitting messages from one place to another irrespective of the distance ...