Researcher questions USB security
8 August 2014 Last updated at 07:03 BST
New research has dramatically called into question the safety and security of using USB to connect devices to computers.
Berlin-based researchers Karsten Nohl and Jakob Lell demonstrated how any USB device could be used to infect a computer without the user's knowledge.
The body responsible for the USB standard said manufacturers could build in extra security.
But Mr Nohl said there is no practical way to defend against the vulnerability.