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: ****** and ****** Follow the Cookie Trail: ****** CERN Computing Centre & Mouse Farm: ****** ****** ****** 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: ******