Open Microsoft's Internet Explorer.  At the top click on the word HELP, slide your mouse down and click on ABOUT INTERNET EXPLORER.

A new window will appear.  The version number will be displayed followed by the cipher strength.

For Internet Explorer 5+ users: currently the the strongest encryption / cipher strength is 128 bit.  If you browser is not 128 bit and you would like it to be, click on the hyperlink "Update Information". This will redirect you Microsoft's website and follow their instructions.