One-time pad
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 Any digital data storage device can be used to transport one-time pad data. |
In cryptography, the one-time pad (OTP) is a type of encryption which has been proven to be impossible to crack if used correctly. Each bit or character from the plaintext is encrypted by a modular addition with a bit or character from a secret random key (or pad) of the same length as the plaintext, resulting in a ciphertext. If the key is truly random, as large as or greater than the plaintext, never reused in whole or part, and kept secret, the ciphertext will be impossible to decrypt or break without knowing the key. It has also been proven that any cipher with the perfect secrecy property must use keys with effectively the same requirements as OTP keys. However, practical problems have prevented one-time pads from being widely used, except with quantum key distribution.
- See also: Wikipedia
- Related: Information theoretic security, Lamport signature, Numbers station, One-time password, Session key, SQR codes, Steganography, Unicity distance
| Guide to Secure Communications with the One-time P... Guide to Secure Communications with the One-time Pad Cipher users.telenet.be/d.rijmenants/papers/one_time_pad.pdf - Web |
| Photographs of numerous OTP artifacts Photographs of numerous OTP artifacts users.telenet.be/d.rijmenants/en/onetimepad.htm - Web |
| Example of a one time pad paper system Example of a one time pad paper system babkjl.wordpress.com/2012/03/18/one-time-pad-cryptography/ - Web |
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