substitution alphabet

substitution alphabet

[‚səb·stə¦tü·shən ′al·fə‚bet]
(communications)
An alphabet used in a coded message in which each letter in the original message is replaced by another letter in the coded message, according to a set of rules.
References in periodicals archive ?
In its simplest form, an encryption scheme might represent each letter by a number - called a substitution alphabet - for example, a = 1, b = 2, c = 3 etc., through z = 26.
To illustrate, suppose our key is the word "bird." Using the same substitution alphabet, bird becomes 2-9-18-4.
* Creating a substitution alphabet by assigning numbers to each letter,