Video: Today's biggest security threats

Attendees at this year's Infosecurity show in London have warned that businesses must be more on their guard than ever.

Traditional threats, such as spam, worms and viruses, are still plaguing inboxes, while more sophisticated insider attacks and insecure infrastructure threaten companies from within.

In this video, leading security experts — including Bruce Schneier from BT Counterpane and the ever controversial Graham Cluley from Sophos — outline what companies should be looking out for in 2007.