Use Your Mac to Share iCal Calendars
mcwetboy writes "Calendar publishing with iCal requires a .Mac membership or a WebDAV server. Most ISPs and hosting companies don't offer WebDAV -- or at least mine don't -- but you can run WebDAV under Apache on your Mac, and publish calendars and share them among a local network or among multiple users of a single computer. Already two different tutorials explaining how to do this have appeared on the Web: this one at Mac OS X Hints and this one courtesy of Shawn Wall. I'm sure Slashdot readers could offer even more suggestions." I set up mod_dav for the first time within an hour of downloading iCal the other day, with help from this article. Now, if only iCal weren't really slow and buggy ...
If you care so much about your personal calendar that you're concerned about transport-level encryption and digital certificates, your priorities may be completely out of whack. Better have them checked out by a qualified professional soonest.