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From OpenPGP specification (RFC 4880) section 13.8 (Reserved Algorithm Numbers):

The reserved public-key algorithms, Elliptic Curve (18), ECDSA (19),
and X9.42 (21), do not have the necessary parameters, parameter
order, or semantics defined.

But GnuPG has ECC support. What they use as a reference? How other developers could support ECC and read messages from GnuPG with ECC?

migrated from stackoverflow.com Jul 26 '15 at 3:08

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3

While OpenPGP in the current revision is defined by RFC 4880, there are two additional RFCs providing extensions:

  • RFC 5581 defines the Camellia Cipher in OpenPGP
  • RFC 6637 defines elliptic curve cryptography in OpenPGP

Furthermore, a draft for EdDSA signatures is already proposed. GnuPG 2.1 already implements this draft.

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