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I have never used PGP nor GnuPG, but I understand that it has more features beyond using say MD5 to verify my downloads. I noticed Wine has a .sign file (i.e. wine-0.9.40.tar.bz2.sign for wine-0.9.40.tar.bz2). I installed http://macgpg.sourceforge.net/ (which has an MD5 for download verification), and since I never used PGP/GnuPG, the instructions seem to just say to create a keypair, which I