This standards reference on Base64Encoding explains openpgp in plain language for developers and everyday users.
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OpenPGP messages and keys are often sent as ASCII armor (RFC 4880): a cleartext block with headers, Base64 body (76-character lines), and a CRC-24 checksum line starting with =.
The Base64 alphabet matches standard RFC 4648 (+/ with = padding). The extras are framing and the CRC, not a different alphabet.
Versus MIME Base64
MIME (RFC 2045)
OpenPGP armor
Line length
≤ 76
≤ 76
Headers
MIME Content-Transfer-Encoding
BEGIN / END armor
Checksum
none
CRC-24 (=XXXX)
Developer tips
Never treat armored text as encryption by itself—the armor is packaging; OpenPGP encryption is separate.
Strip headers before feeding the body to a generic decoder, or use a tool that understands armor.
Our encoder/decoder supports the OpenPGP ASCII armor standard for body encode/decode workflows; use the detector if you are unsure which wrapping you have.
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