On 06/06/2014 12:46 PM, Cpp wrote: > Alright, thanks for elaborating it. Does this mean that the notation > (the "sig-notation issuer-...@notations.openpgp.fifthhorseman.net=%g" > line) is final, and is not going to change in the future?
I don't know if anyone is going to introduce another extension with roughly the same semantics in the future. It also seems likely that future revisions of OpenPGP (OpenPGPv5, though that may take years) will change the issuer-keyID subpacket to just include the full fingerprint (there might also be a different fingerprint mechanism by that point). Anyway, this is the only currently proposed mechanism to provide this information -- and no one else has suggested an alternative that i have seen. > I noticed that GnuPG also offers a "cert-notation" option - should > this be set too or can I safely omit it? > > dkg: I have no idea what the answers should be. But guessing I'd just > put the second answer as "cert-notation > issuer-...@notations.openpgp.fifthhorseman.net=%g" though I'm unsure > whether the presence of cert-notation it is necessary. If you're going to use the cert-notation, i think you'd want to use the exact same name -- the point is that the label offers the full fingerprint of the issuer, so changing it from issuer-fpr to issuer-crt doesn't seem like a good idea. So, should you include this notation in your certifications as well as your data signatures? The use cases i tend to see for ambiguity in data signatures (e.g. "e-mail signature can't be validated, but we do not know whether that is because we have the wrong key or we have a bad signature") seem different in how they're presented to the user from the way that unverifiable certifications are presented. In particular, only fully-verified certifications should ever be used by certification-checking mechanisms, and those that fail to verify should probably be ignored, whether it's because they were bad, or because they are from an unknown key. what do other folks think? would this distinction be useful in certifications? --dkg
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