Extracting a secret key by simply watching the flickering of an LED? Sounds implausible but that's what we're discussing with Dr Mike Pound! Author’s page on the attack: Video-Based Cryptanalysis (nassiben.com) Paper: https://bit.ly/C_PowerLED https://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com/