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Code word (communication) 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.
The message to be systematically encoded is {1,6,3}. Using Lagrange interpolation, F (ai) = 3 x 2 + 2 x + 1, and applying F (ai) for a4 = 3 to a7 = 6, results in the code word {1,6,3,6,1,2,2}. Assume errors occur at c2 and c5 resulting in the received code word {1,5,3,6,3,2,2}.
Some 1s bit in the information part of the code word have changed to 0s. Some 1s bits in the check (or redundant) portion of the code word have changed to 0s. Some 1s bits in both the information and check portions have changed to 0s. For case 1, the number of 0-valued bits in the information section will, by definition of the error, increase ...
This "extra" LRC word at the end of a block of data is very similar to checksum and cyclic redundancy check (CRC). Optimal rectangular code [ edit ] While simple longitudinal parity can only detect errors, it can be combined with additional error-control coding, such as a transverse redundancy check (TRC), to correct errors.
Informally, a code is non-malleable if the message contained in a modified code-word is either the original message, or a completely unrelated value. Non-malleable codes provide a useful and meaningful security guarantee in situations where traditional error-correction and error-detection is impossible; for example, when the attacker can ...
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The word count is the number of words in a document or passage of text. Word counting may be needed when a text is required to stay within certain numbers of words. This may particularly be the case in academia, legal proceedings, journalism and advertising. Word count is commonly used by translators to determine the price of a translation job.
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.
if , decode code word to be all 0's; if +, decode code word to be all 1's; This algorithm is a boolean function in its own right, the majority function. Example. In a (,) code, if R=[1 0 1 1 0], then it would be decoded as,
Computationally bounded adversary. In information theory, the computationally bounded adversary problem is a different way of looking at the problem of sending data over a noisy channel. In previous models the best that could be done was ensuring correct decoding for up to d /2 errors, where d was the Hamming distance of the code.