Media playback is unsupported on your device

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.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.