Radix64
Radix64 is the Base64 variant used by OpenPGP, adding a 24-bit CRC check, with = padding and line folding.
Purpose
It transports binary data over ASCII channels with integrity checking, used for textual export of PGP signatures and keys.
Mechanism
Binary data is mapped 3 bytes to 4 characters onto a 64-character alphabet, 76 characters per line; the output ends with = padding plus a 4-character CRC24 checksum prefixed by =.
Use cases
- OpenPGP signature block encoding
- PGP public key export
- ASCII armor format