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The block code and its parameters. Error-correcting codes are used to reliably transmit digital data over unreliable communication channels subject to channel noise . When a sender wants to transmit a possibly very long data stream using a block code, the sender breaks the stream up into pieces of some fixed size.
Parsing. Parsing, syntax analysis, or syntactic analysis is the process of analyzing a string of symbols, either in natural language, computer languages or data structures, conforming to the rules of a formal grammar. The term parsing comes from Latin pars ( orationis ), meaning part (of speech). [1]
Transcoding. Transcoding is the direct digital-to-digital conversion of one encoding to another, [1] such as for video data files, audio files (e.g., MP3, WAV ), or character encoding (e.g., UTF-8, ISO/IEC 8859 ). This is usually done in cases where a target device (or workflow) does not support the format or has limited storage capacity that ...
In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code, or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.
Motivation for list decoding. Given a received word , which is a noisy version of some transmitted codeword , the decoder tries to output the transmitted codeword by placing its bet on a codeword that is “nearest” to the received word. The Hamming distance between two codewords is used as a metric in finding the nearest codeword, given the ...
Clipper chip. The Clipper chip was a chipset that was developed and promoted by the United States National Security Agency [1] (NSA) as an encryption device that secured "voice and data messages" [2] with a built-in backdoor that was intended to "allow Federal, State, and local law enforcement officials the ability to decode intercepted voice ...
Decoding methods. In coding theory, decoding is the process of translating received messages into codewords of a given code. There have been many common methods of mapping messages to codewords. These are often used to recover messages sent over a noisy channel, such as a binary symmetric channel .
The scanned words are placed alongside a normal captcha widget so users decode both words at the same time. The word can be run by multiple people to cut down on errors.