Tool to decrypt/encrypt with Playfair automatically. PlayFair Cipher is a symmetrical encryption process based on a polygrammic substitution. Created in 1854 by Charles Weatstone, it is named in honor of Lord PlayFair who popularized its use.

dCode is free and its tools are a valuable help in games, puzzles and problems to solve every day!You have a problem, an idea for a project, a specific need and dCode can not (yet) help you? You need custom development? Contact-me!

Message for dCode's author:

Team dCode read all messages and answer them if you leave an email (not published). It is thanks to you that dCode has the best PlayFair Cipher tool. Thank you.

Without knowing key

PlayFair Encoder

Tool to decrypt/encrypt with Playfair automatically. PlayFair Cipher is a symmetrical encryption process based on a polygrammic substitution. Created in 1854 by Charles Weatstone, it is named in honor of Lord PlayFair who popularized its use.

Answers to Questions

How to encrypt using PlayFair cipher?

Playfair encryption uses a grid, which can be generated by a key word.

How to recognize PlayFair ciphertext?

It is impossible that a letter is crypted by itself. (Thanks to LeSingeMalicieux)

How to decipher PlayFair without grid?

PlayFair can be cracked using a known plaintext attack in order to discover a part of the grid.

Multiple grids can fit a PlayFair cipher?

Several square can be used for the same decryption of Playfair, in fact, once a square grid of 25 is found, other squares obtained from the previous by rotating rows and / or columns gives the same result.

What are the variants of the PlayFair cipher?

Multiple variants can be found when encrypting bigrams. When letters are in column or in lines, it is possible to cipher with the on on the right or on the left, or above or below. Again, when the letters are diagonally positioned, it is possible to write letter1-letter2 or letter2-letter1