2FA: Two Factor Authentication - Computerphile

Just what's going on when your email provider wants to send you a text message? Dr Mike Pound talks about multi-factor authentication.
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This video was filmed and edited by Sean Riley.
Computer Science at the University of Nottingham: bit.ly/nottscom...
Computerphile is a sister project to Brady Haran's Numberphile. More at www.bradyharan.com