TheCodeBreakers
facilitates understanding. A glossary may also serve as a handy reference. The definitions in this one are
informal and ostensive. Exceptions are ignored and the host of minor terms are not defined—the text covers
these when they come up.
The plaintext is the message that will be put into secret form. Usually the plaintext is in the native
tongue of the communicators. The message may be hidden in two basic ways. The methods of
steganography conceal the very existence of the message. Among them are invisible inks and microdots
and arrangements in which, for example, the first letter of each word in an apparently innocuous text spells
out the real message. (When steganography is applied to electrical communications, such as a method that
transmits a long radio message in a single short spurt, it is called transmission security.) The methods of
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