GNU Privacy Guard
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The GNU Privacy Guard (GnuPG or GPG) is the standard for encrypting e-mail messages, instant messaging conversations and files on the Internet. It works by encrypting messages using asymmetric keypairs individually generated by GnuPG users. You generate a key-pair, give the public key to your friends and keep for yourself - and decrypt with - a private key which is protected by a passphrase.
[edit] Finding peoples keys
This little shell script will check a number of known nameservers for a persons public GnuPG/PGP key. Keys are identified by a number such as 0x79E48D63A1A23194.
File: fetachkey |
#!/bin/bash # # Thanks to George Shaffer # if [ "$1" == "" ];then echo "Enter a key as argument!" exit 1 fi echo 'tickets.rutgers.edu tickets.rutgers.edu pgp.mit.edu keyserver.veridis.com pgp.keyserver.ch pgp.surfnet.nl www.stinkfoot.org pgp.es.net pgp.rediris.es pgp.nic.ad.jp pgp.uk.demon.net pgp.zdv.uni-mainz.de keyserver.linux.it keys.iif.hu pgp.eteo.mondragon.edu'|while read keyserver;do if gpg --keyserver $keyserver --recv-key $1 then echo Found key at $keyserver exit fi done |