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crossword security alarm. In 1944, codenames related to the D-Day plans appeared as solutions in crosswords in the British newspaper, The Daily Telegraph, which the British Secret Services initially suspected to be a form of espionage.
Crossword. An American-style crossword grid layout. A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues.
In coding theory, a parity-check matrix of a linear block code C is a matrix which describes the linear relations that the components of a codeword must satisfy. It can be used to decide whether a particular vector is a codeword and is also used in decoding algorithms.
Add a letter and crack the code! Add a letter and crack the code!
More formally, a (,,)-locally decodable code encodes an -bit message to an -bit codeword () such that any bit of the message can be recovered with probability by using a randomized decoding algorithm that queries only bits of the codeword (), even if up to locations of the codeword have been corrupted.
For example: "Knight" for N (the symbol used in chess notation) Taking this one stage further, the clue word can hint at the word or words to be abbreviated rather than giving the word itself. For example: "About" for C or CA (for "circa"), or RE. "Say" for EG, used to mean "for example".
Code word may refer to: Code word (communication), an element of a standardized code or protocol; Code word (figure of speech), designed to convey a predetermined meaning to a receptive audience, while remaining inconspicuous to others Procedure word, in voice communication
One method is to pick codewords in order from most probable to least probable symbols, picking each codeword to be the lexicographically first word of the correct length that maintains the prefix-free property.
When a codeword is received or read, the device either compares its check value with one freshly calculated from the data block, or equivalently, performs a CRC on the whole codeword and compares the resulting check value with an expected residue constant.
In communication, a code word is an element of a standardized code or protocol. Each code word is assembled in accordance with the specific rules of the code and assigned a unique meaning. Code words are typically used for reasons of reliability, clarity, brevity, or secrecy.