Websites can still be hacked using SQL injection - Tom explains how sites written in PHP (and other languages too) can be vulnerable and have basic security issues.

More from Tom Scott: www.youtube.com/user/enyay and twitter.com/tomscott

Follow the Cookie Trail: www.youtube.com/watch
CERN Computing Centre & Mouse Farm: www.youtube.com/watch

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: bit.ly/bradychannels