Noun
(cryptography) A book, table, database, or other object that stores the mapping between plaintext words or phrases and their equivalents in a code.
(computer science) A lookup table.
Source: en.wiktionary.orgA code that achieves the entropy rate of a sequence for a given model, plus the codebook (i.e. the probabilistic model), is one such program, but it may not be the shortest. Source: Internet
Details German Kenngruppenheft (a U-boat codebook with grouped key codes) Monthly key list Number 649 for the German Air Force Enigma, including settings for the reconfigurable reflector. Source: Internet
Codes operated by substituting according to a large codebook which linked a random string of characters or numbers to a word or phrase. Source: Internet
Codebooks and codebook publishers proliferated, including one run as a front for the American Black Chamber run by Herbert Yardley between the First and Second World Wars. Source: Internet
In his earliest code, Morse had planned to transmit only numerals, and to use a codebook to look up each word according to the number which had been sent. Source: Internet
In some cases, a codebook can be also used to entropy code the discrete value in the same step, by generating a prefix coded variable-length encoded value as its output. Source: Internet