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I want to expand on one of the points I just made. As I think about the issue more, the more I see signings of posts as being more of a help to my enemies (prosecutors, in this context) and less of a help to my friends.
I would assume that, if they're interested in your postings, they'll record them at the source, either by tapping your phone or wiretapping your house. In that case, signing your postings would make it more difficult to forge a posting with your name on it. On the other hand, if they break your private key's password, you're in bigger trouble.
I'm not saying that signatures are not a Good Thing. Indeed, if I ever get a version of PGP or S/MIME adequately integrated with my OS and Eudora Pro, I may (or may not) start auto-signing all e-mail. (Gulp.)
PGP is coming soon. In the meantime, you can use FileCrypt, which works well with Eudora on the Mac (I'm running it under an 8.0 beta without problems). There's a time-limited demo version at <http://www.highware.com> It is not encumbered by export control. Martin. -----BEGIN PGP SIGNATURE----- Version: 2.6.2, by FileCrypt 1.0 iQCVAwUBM4UdTG23+ciinrc5AQGdRgP/Sj7QGYGvqM6e4EaRs1G/MRZseryAgWRD CcZKuiGaGRr3dyyXQ8sMPivNfD/wh46vHN7csUM0qC/H03e+A983bHcD3B0RsiIx yXPI2lZThcYKYMmMjJyWccT7AoQB3dRtQFO/7EGeoJxOcruF5bavdKcJF6wUOFkL nXBdc50UJWE= =P/ni -----END PGP SIGNATURE-----