I got the answer
Ok, I use a freeware program that is called PGP. It uses Public/Private Key encryption. It is very good, but I think that the new version has a trial on it, so I am hosting a backed version on my site that has no trial. The file size is lik 8 Megs and I only get a gig of bandwidth per month, so try not to constantly download it seven times a day or I'll have to move the file.
[url]http://www.freewebtown.com/Rapt0r*/PGP80*-PF-W.zip[/url]
There are some very good docs that come with it that explain all about how Public/Private Encryption works, but basically you use one key to encrypt and a different one to decypt. This means that you can send your buddy something that he and only he can decrypt. It also has a powerful freespace wipe feature that will make data that you have deleted from your hard-drive unrecoverable no matter what tool the user uses.
It is hard to explain the keys, but if you have a bit of knowledge, you'll be able to figure it out and the docs that come with it do a good job of explaining.
4* 6E 20 65 6C 65 6* 74 72 6F 6E 6* 6* 20 77 6* 72 66 6* 72 65 2C 20 74 68 65 20 77 6* 6E 6E 65 72 20 6* 7* 20 74 68 65 20 6F 6E 65 20 77 68 6F 20 62 75 6* 6C 74 20 74 68 65 20 45 4D 50 2E
Translation = "In electronic warfare, the winner is the one who built the EMP."