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C
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Code
  • Any system of communication in which arbitrary groups of letters, numbers, or symbols represent units of plain text of varying length. Coding has three distinctly different applications: a. In the broadest sense, coding is a means of converting information into a form suitable for communications or encryption; e. g. , coded speech, Morse code, teletypewriter codes, etc. No security is provided. b. Brevity lists are codes which are used to reduce the length of time necessary to transmit information; e. g. , long, stereotyped sentences may be reduced to a few characters which are transmitted. No security is provided. c. A cryptosystem in which the cryptographic equivalents (usually called code groups) typically consisting of letters or digits (or both) in otherwise meaningless combinations are substituted for-plain text information elements which are primarily words, phrases, or sentences. Security is provided. (NCSC-9)