Null cipher

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.

This article is about the classical encryption method. For the configuration option in modern communication systems, see Null encryption.

This is one of three categories of cipher used in classical cryptography along with substitution ciphers and transposition ciphers.

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