The playfair cipher uses a 5×5 grid of letters, and encrypts a message by breaking the text into pairs of letters and swapping them according to their positions in a rectangle within that grid It was used by the militaries of several nations through at least world war i, and is known to have been used during world war ii by british intelligence services Wadsworth invented a cipher that became known as the wheatstone cipher
The story of cryptology by craig p He was responsible for the then unusual playfair cipher, named after his friend lord playfair Bauer, pg 168 i added the not to be confused with and got rid of the line that said that the playfair cipher was known as the wheatstone cipher.
Building a cipher table with the code phrase cipher Wikimedia commons has media related to classical ciphers.pages in category classical ciphers the following 53 pages are in this category, out of 53 total This list may not reflect recent changes. Summary description playfair cipher 01 hi to bm (cropped).png playfair example step 01 date 6 july 2010 source own work author davidtheterp other versions this image has been extracted from another file
Playfair cipher 01 hi to bm.png The example used needs to be changed, because usually the letter removed from the box is the letter j, not the q as is done in the example. The unit of substitution is a sequence of two or more letters rather than just one (e.g., playfair cipher) transposition cipher The ciphertext is a permutation of the plaintext (e.g., rail fence cipher)
Wheatstone's remarkable ingenuity was also displayed in the invention of ciphers
