 | This article needs additional citations for verification. (June 2023) |
A null cipher, also known as concealment cipher, is an ancient form of encryption where the plaintext is mixed with a large amount of non-cipher material. Today it is regarded as a simple form of steganography, which can be used to hide ciphertext.[1]
This is one of three categories of cipher used in classical cryptography along with substitution ciphers and transposition ciphers.[2]
- ^ Gordon, Adam (2015). Official (ISC)2 Guide to the CISSP CBK - Fourth Edition. (ISC)2 Press. p. 349. ISBN 978-1939572066.
- ^ Cite error: The named reference
:2was invoked but never defined (see the help page).