Remember the PGP-signing
I added to my comments system a while back? Srijith has created a Movable Type plugin
that adds PGP comments to Movable Type weblogs.
He's using Ben Trott's Crypt::OpenPGP to parse the PGP signatures. Update:
He used the module as a guide for parsing PGP signaturesit's not required to run the plugin.
Srijith also adds a very clever bit of functionality by showing how you can include the URL of your public key within your PGP signature itself. This doesn't solve the web of trust/signing issues, but it makes it much easier to at least verify the signature you're looking at. This distributed method of securing identity is about small pieces loosely joined (so to speak), and the pieces are loosely joining.
Here's a page he has devoted to the plugin: PGPComments