The FreeS/WAN IPSEC for Linux project has all its documentation online. Main URL: http://www.freeswan.org/ Documentation: http://www.freeswan.org/doc.html Three files under http://www.freeswan.org/freeswan_trees/freeswan-1.5/doc/ have links that might be of interest: links.ipsec.html links.crypto.html links.linux.html It is all under GPL, so if anyone wants any of that as a starting point for a resource page for this list, help yourselves. If anyone knows of resources that should be listed above and aren't, let me know. I'll happily add them. There's also a list of mailing lists: http://www.freeswan.org/freeswan_trees/freeswan-1.5/doc/mail.html I'll be adding this one shortly. Anyone know of others not listed? Linux-crypto: cryptography in and on the Linux system Archive: http://mail.nl.linux.org/linux-crypto/