Coded-Character Sets: History and Development
Coded-Character Sets: History and Development
Theory of Information and Coding
Theory of Information and Coding
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The term code has a particular meaning in cryptography, and is also sometimes used as a synonym for program or part of a program. But for the purposes of this article, a code is a non-secret mapping between a symbol of an alphabet (e.g. our alphabet of letters) and a number of digits of a number system (e.g. six bits for base 2). To be more precise, the mathematician would say that a code is a pair (Σ Π) where Σ is the symbol space (the set of symbols to be coded) and the Π are numeric combinations (the codes). Suppose that S is some symbol in the symbol space Σ and P is one of the permutations of the digits in a numeric counting system Π. We might say "S is mapped into P" or that "S is represented by P," using the symbols: