This subpacket MUST only appear as a hashed subpacket of an
Attestation Key Signature.
This subpacket contains a complete Signature packet body as
specified in Section 5.2 above.
Denotes whether the signature is exportable for other users.
The Features subpacket denotes which advanced OpenPGP features a
user's implementation supports.
The OpenPGP Key fingerprint of the intended recipient primary key.
The OpenPGP Key fingerprint of the key issuing the signature.
The OpenPGP Key ID of the key issuing the signature.
The validity period of the key.
This subpacket contains a list of binary flags that hold information
about a key.
This is a list of one-bit flags that indicate preferences that the
keyholder has about how the key is handled on a key server.
This subpacket describes a "notation" on the signature that the
issuer wishes to make.
Placeholder for backwards compatibility.
This subpacket contains a URI of a document that describes the policy
under which the signature was issued.
AEAD algorithm numbers that indicate which AEAD algorithms the
keyholder prefers to use.
Compression algorithm numbers that indicate which algorithms the
keyholder prefers to use.
Message digest algorithm numbers that indicate which algorithms the
keyholder prefers to receive.
This is a URI of a key server that the keyholder prefers be used for
updates.
Symmetric algorithm numbers that indicate which algorithms the keyholder
prefers to use.
This is a flag in a User ID's self-signature that states whether this
User ID is the main User ID for this key.
Used in conjunction with trust Signature packets (of level greater 0) to
limit the scope of trust that is extended.
Signature's revocability status.
Authorizes the specified key to issue revocation signatures for this
key.
This subpacket is used only in key revocation and certification
revocation signatures.
The time the signature was made.
The validity period of the signature.
This subpacket identifies a specific target signature to which a
signature refers.
This subpacket allows a keyholder to state which User ID is
responsible for the signing.
Signer asserts that the key is not only valid but also trustworthy at
the specified level.