Caesar Cipher
A simple substitution technique where each letter is shifted a fixed number of places down the alphabet.
Try Caesar CipherWhat is Cryptography?
Cryptography is the practice of securing communication. It converts readable information (plaintext) into an unreadable format (ciphertext) so only authorized parties can understand it. This website focuses on four fundamental classical algorithms used historically to protect secrets.
Available Ciphers
Playfair Cipher
A digraph substitution cipher using a 5x5 grid of letters to encrypt pairs of letters instead of single ones.
Try Playfair CipherRow Transposition
A method where the message is written out in rows of a fixed length and then read out column by column.
Try Row TranspositionRail Fence Cipher
A transposition cipher that writes the message in a zigzag pattern across multiple "rails" or lines.
Try Rail Fence Cipher