One Time Pad Cipher

Vigenere-style pad where the key must be at least as long as the message.

The one time pad is theoretically unbreakable when the key is truly random, used only once, and at least as long as the message. This tool encrypts or decrypts one-time pads when you already have the key.

Plaintext

Alphabet Key

Enter a keyword, phrase, or alphabet and the rest will be calculated for you.

Encryption Key

Ciphertext