So, why don more people use certificates and encryption?
Cost. These days, you can get a browser for free. You can get an E-mail client for free. Heck, you can get an entire PC, including an OS and applications, for “free” (if you sign up with the right ISP). But you can’t get a digital certificate for free. The most popular certificate vendor, VeriSign, charges $10 per year for a very low-end “Class 1” certificate–and all that really does is prove that you have a valid E-mail address. (VeriSign offers more secure certificates for E-commerce and developers, but they cost much more. A Java-Signing Certificate, for example, costs $400 per year.) Hassle. E-mail has become the lingua franca of business because it’s so fast and easy. Appending a certificate and encrypting your messages takes extra steps, extra clicks, extra thought, and extra time.