On Thu, Jul 21, 2005 at 07:39:32AM +0200, Werner Koch wrote:
Hello!
I'd like to have a clarification of the signature subpacket
5.2.3.22. Signer's User ID
(String)
This subpacket allows a keyholder to state which User ID is
responsible for the signing. Many keyholders use a single key for
different purposes, such as business communications as well as
personal communications. This subpacket allows such a keyholder to
state which of their roles is making a signature.
This subpacket is not appropriate to use to refer to a User
Attribute packet.
It is not clear to me whether the string should be a verbatim copy of
the content of a User ID packet or some other information. The second
paragraph could be viewed as a hint for a verbatim copy.
I suggested that second paragraph when I was documenting the user
attribute / photo ID stuff. There are some problems using a Signer's
User ID with attribute IDs, both in size and in knowing how to parse
the thing.
A while back, I posted a proposal to fix this:
http://www.imc.org/ietf-openpgp/mail-archive/msg04775.html
David