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Linear A and Cretan hieroglyphs are scripts from an unknown language, one possibility being a yet to be deciphered Minoan language. [1] Several words have been decoded from the scripts, but no definite conclusions on the meanings of the words have been made. Phaistos Disc, c. 2000 BC. Linear A, c. 1800 BC – 1450 BC, partially deciphered ...
The information in hidden messages is not immediately noticeable; it must be discovered or uncovered, and interpreted before it can be known. Hidden messages include backwards audio messages, hidden visual messages, and symbolic or cryptic codes such as a crossword or cipher. There are many legitimate examples of hidden messages, though many ...
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A code word is a word or a phrase designed to convey a predetermined meaning to an audience who know the phrase, while remaining inconspicuous to the uninitiated. For example, a public address system may be used to make an announcement asking for "Inspector Sands" to attend a particular area, which staff will recognise as a code word for a fire or bomb threat, and the general public will ignore.
The problem of bounding the size of an automaton that distinguishes two given strings was first formulated by Goralčík & Koubek (1986), who showed that the automaton size is always sublinear. [2] Later, Robson (1989) proved the upper bound O ( n 2/5 (log n ) 3/5 ) on the automaton size that may be required. [ 3 ]
However, in cryptography, code has a more specific meaning: the replacement of a unit of plaintext (i.e., a meaningful word or phrase) with a code word (for example, "wallaby" replaces "attack at dawn"). A cypher, in contrast, is a scheme for changing or substituting an element below such a level (a letter, a syllable, or a pair of letters, etc ...
Word problem (mathematics), a decision problem for algebraic identities in mathematics and computer science; Word problem for groups, the problem of recognizing the identity element in a finitely presented group; Word problem (computability), a decision problem concerning formal languages "Word Problems", an instrumental by Deadmau5 from the ...