Search results for: “cipher”
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Cipher Text
Cipher Text in the National Security Context A definition and brief description of Cipher Text in relation to national security is as follows:Series of symbols produced by a cipher to convey a message; intended to be unreadable by unauthorized persons.
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Cipher Key
Cipher Key in the National Security Context A definition and brief description of Cipher Key in relation to national security is as follows:A sequence of symbols that a user of a given cipher system must possess in order to use the system. Without a key, a user cannot encipher messages (turn […]
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Block Cipher
Block Cipher in the National Security Context A definition and brief description of Block Cipher in relation to national security is as follows:A cipher that transforms fixed-length blocks of plaintext into ciphertext and vice-versa.
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Cipher Disk
Cipher Disk in the National Security Context A definition and brief description of Cipher Disk in relation to national security is as follows:A handheld coding device for generating a limited number of substitution ciphers, that is, ciphers in which each letter of the regular alphabet is […]
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Cipher Disk
Cipher Disk in the National Security Context A definition and brief description of Cipher Disk in relation to national security is as follows:A handheld coding device for generating a limited number of substitution ciphers, that is, ciphers in which each letter of the regular alphabet is […]
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Cipher Machine
Cipher Machine in the National Security Context A definition and brief description of Cipher Machine in relation to national security is as follows:A mechanical device that assists in the production of ciphertext from plaintext and vice versa. In this broad sense, any mechanical aid from a […]
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Cipher Machine
Cipher Machine in the National Security Context A definition and brief description of Cipher Machine in relation to national security is as follows:A mechanical device that assists in the production of ciphertext from plaintext and vice versa. In this broad sense, any mechanical aid from a […]
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Cipher
Cipher in the National Security Context A definition and brief description of Cipher in relation to national security is as follows:A cipher uses a system of fixed rules (an algorithm) to transform a legible message (plaintext) into an apparently random string of characters (ciphertext).
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Cipher Pad
Cipher Pad in the National Security Context A definition and brief description of Cipher Pad in relation to national security is as follows:A printed list of cipher keys, each intended to be used for the encipherment and decipherment of a single message. Cipher pads (also termed one-time pads) […]
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Stream Cipher
Stream Cipher in the National Security Context A definition and brief description of Stream Cipher in relation to national security is as follows:Stream ciphers operate upon a series of binary digits ( bits, usually symbolized as 1s and 0s), enciphering them one by one rather than in […]
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Stream Cipher
Stream Cipher in the National Security Context A definition and brief description of Stream Cipher in relation to national security is as follows:Stream ciphers operate upon a series of binary digits ( bits, usually symbolized as 1s and 0s), enciphering them one by one rather than in […]
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ADFGX Cipher
Adfgx Cipher in the National Security Context A definition and brief description of Adfgx Cipher in relation to national security is as follows:A code that applies the Polybius square in such a way that the letters A, D, F, G, and X take the place of numbers for the rows and columns. Some […]
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ADFGX Cipher
Adfgx Cipher in the National Security Context A definition and brief description of Adfgx Cipher in relation to national security is as follows:A code that applies the Polybius square in such a way that the letters A, D, F, G, and X take the place of numbers for the rows and columns. Some […]
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Playfair Cipher
Playfair Cipher in the National Security Context A definition and brief description of Playfair Cipher in relation to national security is as follows:The Playfair cipher is a method of cryptography invented in 1854 by English physicist Sir Charles Wheatstone (1802 1875).
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Playfair Cipher
Playfair Cipher in the National Security Context A definition and brief description of Playfair Cipher in relation to national security is as follows:The Playfair cipher is a method of cryptography invented in 1854 by English physicist Sir Charles Wheatstone (1802 1875).