The Encode reference article from the English Wikipedia on 24-Apr-2004
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Encode

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In communications and information processing, encoding is the process by which a source (object) converts information into message data, which is then sent to a receiver(observer), such as a data processing system.

In telecommunication, the term encode has the following meanings:

1. To convert data by the use of a code, frequently one consisting of binary numbers, in such a manner that reconversion to the original form is possible.

2. [To] Convert plain text to equivalent cipher text by means of a code. See cipher.

3. To append redundant check symbols to a message for the purpose of generating an error detection and correction code.

See also: Character encoding, Channel coding, 2B1Q, B8ZS, AMI or HDB3.

Source: from Federal Standard 1037C and from MIL-STD-188 and from the National Information Systems Security Glossary