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    <p>Thunderbird has a neat plugin called Enigmail for doing just what you want.</p> <p>There are two systems for encrypting emails (and for assuring the authenticity of keys), S/MIME and PGP/MIME. The former uses a traditional PKI (public key infrastructure), meaning that your key has to be signed by a certificate authority to be usable.</p> <p>Thawte has a Freemail service for signing email certificates for free, if you can find people in your area who can certify your identity in person (you will need to take at least one form of government-issued photo ID, preferably two, when you are being certified, such as passport and driving licence).</p> <p>The PGP system uses a more grass-roots style of authenticating. You simply find other people who are already well known in the PGP "web of trust", and get them to verify you (again with similar documentary requirements, though different signers have different requirements).</p> <p>To find such other people, you should seek out "PGP <a href="http://en.wikipedia.org/wiki/Key_signing_party" rel="nofollow noreferrer">keysigning parties</a>". They're occasions where everybody brings their ID, and everybody signs everybody else's key.</p> <p>So to answer your question about how to trust keys you download: in the S/MIME model, a trusted CA (such as Thawte) has to sign it. In the PGP model, people who are "well known" (to you, at least, and preferably to most PGP users) have to sign it.</p> <p>I happen to be a Thawte Web of Trust notary, so if you want to go the S/MIME route, live near Auckland, and happen to want to be verified, write a comment here or something. :-P</p>
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