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tag
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... OpenPGP message is constructed from a number of records that are
traditionally called packets. A packet is a chunk of data that has a
tag specifying its meaning. An OpenPGP message, keyring, certificate,
...
...
The first octet of the packet header is called the "Packet Tag." It
determines the format of the header and denotes the packet contents.
...
... interoperability is not an issue, either format may be
used. Note that old format packets have four bits of content tags,
and new format packets have six; some features cannot be used and
still be backward-compatible ...
... Packet Tags ...
...
The packet tag denotes what type of packet the body holds. Note that
old format headers can only have tags ...
... tag denotes what type of packet the body holds. Note that
old format headers can only have tags less than 16, whereas new
format headers can have tags ...
... tags less than 16, whereas new
format headers can have tags as great as 63. The defined tags (in
decimal) are:
...
... Signature Packet (Tag 2) ...
... One-Pass Signature Packets (Tag 4) ...
... Public Key Packet (Tag 6) ...
...
A Public Subkey packet (tag 14) has exactly the same format as a
Public Key packet, but denotes a subkey ...
...
Note: in PGP 2.6.x, tag 14 was intended to indicate a comment packet.
This tag was selected for reuse because no previous version ...
... PGP 2.6.x, tag 14 was intended to indicate a comment packet.
This tag was selected for reuse because no previous version of PGP
...
... Secret Key Packet (Tag 5) ...
... Compressed Data Packet (Tag 8) ...
... Symmetrically Encrypted Data Packet (Tag 9) ...
... PGP generated Literal packets with
this tag. With PGP 5.x, this packet has been re-assigned and is
reserved for use as the Marker packet.
...
... User ID Packet (Tag 13) ...
... SHA-1 hash of the one-octet Packet
Tag, followed by the two-octet packet length, followed by the entire
Public Key packet ...