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If you're a PGP or GPG user, I'll be at BETT all day Thursday, and happy to make mutual key signings at some point during the day.
Usual rules apply: bring some photo ID and a printed copy of your key fingerprint and key length. It helps if your key is on a public key server, but not essential.
If you'd like a signing please post here before BETT so we can get the admin out of the way first :)
What exactly is this for?
GPG is a free implementation of PGP (pretty good privacy), an encryption and digital signature engine. It's based around keys, which are either issued by an authority or self-generated by a user (similar to SSL certificates).
Signing keys of other people who's identity you have verified creates a web of trust, meaning a third party can tentatively (or moreso) trust the first and second parties. But as users are still sparse, it's worth getting signings done while travelling, so a mutual offer like this is common.
http://aplawrence.com/Basics/gpg.html