codegroup - 20080907+ds1-1 main

codegroup encodes any file into five-letter code groups, allowing it to be
transmitted through any medium, and decodes files containing codegroups into
the original input. Encoded files contain a 16-bit cyclical redundancy check
(CRC) and file size to verify, when decoded, that the message is complete and
correct. Files being decoded may contain other information before and after
the codegroups, allowing in-the-clear annotations to be included.
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codegroup makes no attempt, on its own, to prevent your message from being
read. Cryptographic security should be delegated to a package intended for
that purpose, such as pgp. It can then be applied to the encrypted binary
output, transforming it into easily transmitted text. Text created by it
uses only upper case ASCII letters and spaces. Unlike files encoded with
uuencode or pgp's "ASCII armour" facility, the output of codegroup can be
easily (albeit tediously) read over the telephone, broadcast by shortwave
radio to agents in the field, or sent by telegram, telex, or Morse code.