Svetlin Nakov Sofia University “St. Kliment Ohridski” Bulgaria This article was intentionally removed from www.nakov.com, because the publishing rights are now owned by Jupitermedia Corp. Please follow these links to read it: Part 1. Basic Concepts Related to Digital Signatures: http://www.developer.com/security/article.php/3083161 Part 2. How Digital Signatures Work: Digitally Signing Messages: http://www.developer.com/security/article.php/3092771 Part 3. Using Digital