Can physical systems be hacked?
9 July 2012 Last updated at 13:42 BST
With the Olympic Games almost upon us, security around potential terrorist targets is being strengthened. But is our infrastructure vulnerable less to physical assault than to cyber-attack?
A new search engine reveals that a large number of physical systems ranging from webcams to forensic lab heating systems are connected to the internet.
The World At One's Chris Vallance reports.