Playfair Cipher
Encrypt or decrypt text with the Playfair digraph cipher.
Note: The Playfair cipher encrypts pairs of letters (digraphs) using a 5x5 square built from a keyword. It merges I and J, inserts an X filler for repeated or trailing letters, and is not secure for modern use.
What Is a Playfair Cipher?
The Playfair Cipher tool encrypts and decrypts text using a 5x5 digraph (pair-of-letters) substitution built from a keyword. It was the first practical digraph cipher and was used by the British in World War I.
How to Use This Playfair Cipher
- 1Enter KeywordType a word used to build the 5x5 square.
- 2Enter TextType the plaintext or ciphertext.
- 3Choose DirectionClick Encrypt or Decrypt to transform the text.
Frequently Asked Questions
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