I use the Pretty Good Protection (PGP) to sign and sometimes encrypt messages. The link below points to my public key.
If you are interested in signing and encrypting messages, then have a look at the following links:
University of Skövde, P.O. Box 408, SE-541 28 Skövde, SWEDEN, Phone: +46 500-448000, Fax: +46 500-416325, webmaster@his.se