Radix-64
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Radix-64 is a data encoding scheme that consists of base64-encoded data with a 24-bit CRC appended to it, and is specified in RFC 2440. Radix-64 encoding may be used by computer programs whose output meets the OpenPGP standard, also specified in RFC 2440, to permit encrypted data to be sent as ordinary ASCII text through email, without the need to treat the data as an attached file.
PGP's documentation referrs to this format, in passing, as ASCII Armor, although in a way that suggests they are referring to any similar format (like base64 or BinHex).
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External links
- OpenPGP Message Format, RFC 2440, http://www.faqs.org/rfcs/rfc2440.html
- POSIX a64l and l64a library calls http://www.opengroup.org/onlinepubs/009695399/functions/a64l.html