Null cipher
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This article is about the classical encryption method. For the configuration option in modern communication systems, see Null encryption.
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]
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This is one of three categories of cipher used in classical cryptography along with substitution ciphers and transposition ciphers.[2]