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Reference.org
Null cipher
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<p>A null cipher, also known as concealment cipher, is an ancient form of <a href="/facts/Encryption/16q29Fdv">encryption</a> where the <a href="/facts/Plaintext/tWnBDCgE">plaintext</a> is mixed with a large amount of non-cipher material. Today it is regarded as a simple form of <a href="/facts/Steganography/RGLdKYcE">steganography</a>, which can be used to hide ciphertext. </p><p>This is one of three categories of cipher used in <a href="/facts/Classical_cryptography/uXMQS0tE">classical cryptography</a> along with <a href="/facts/Substitution_ciphers/PCTy2EJL">substitution ciphers</a> and <a href="/facts/Transposition_cipher/mmch3Mgu">transposition ciphers</a>. </p>