Hosts: Steve Gibson with Leo Laporte Steve explains the theory and practice of multifactor authentication which uses combinations of "something you know," "something you have," and "something you are" to provide stronger remote authentication than traditional, unreliable single-factor username and password authentication. For 16kpbs versions, transcripts, and notes (including fixes), visit Steve's site: grc.com, also the home of the best disk maintenance and recovery utility ever written Spinrite 6. Security Now is brought to you by Astaro Internet Security. Bandwidth for Security Now! is provided by AOL Radio.