The One Time Pad encryption method is very simple, and impossible to crack without the actual pad file against which the to-be-encrypted message is XOR'ed. Encryption and decryption are performed using excactly the same method, and the message will decrypt correctly only if the same pad is used in decryption as was use in encryption. WWW: https://metacpan.org/release/Crypt-OTP Seamus Venasse