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.

The Playfair cipher or Playfair square or Wheatstone-Playfair cipher is a manual symmetric encryption technique and was the first literal digram substitution cipher. The scheme was invented in 1854 by ...

The playfair cipher is a block cipher that is quite effective in obfuscating text. Frequency analysis is not an effective cryptanalysis tool to crack playfair ciphers because each letter can be ...

Transposition Cipher, etc. Playfair cipher and Hill cipher have been dealt at length, providing examples of encryption and decryption and codes for the implementation in C and C++. In addition, many ...

The German police made the mistake in late 1941 of switching from the rather strong Double Transposition cipher to the more accessible Double Playfair, and for over a year Bletchley Park was able ...