Microsoft Internet Explorer®:
From the Internet Explorer menu bar, click Help / About Internet Explorer. Your browser version number appears next to "Version". Under the "Version" information is the "Cipher Strength". The number that appears here indicates your encryption level. If it does not say 128-bit, you need to upgrade your browser.
From the Netscape Navigator menu bar, select Help / About Navigator… (or Communicator). Look for the section on the left that begins "Contains encryption software from RSA Data Security, Inc." If the next paragraph reads, "This version supports U.S. security…", then your browser supports 128-bit encryption. However, if it reads "international security", then your browser only supports 40-bit encryption and you will need to upgrade.