Ghosts Within...

August 2009

Attacks may come from inside computers. The next wave of hacking into computers and stealing data will not be requests or code coming from remote points across the Web, security experts are warning. Instead, the most sophisticated Trojan Horses appearing on Wall Street financial systems may be threaded into the silicon of integrated circuits by design, their malicious instructions baked right into the tiny physical aspects and intricate mapping of the chip itself, according to scientists and academics working with the National Institute of Standards and Technology, the White House and the Financial Services Information Sharing and Analysis Center in Dulles, Virginia. Detecting such malware after a chip is fabricated will be extremely difficult, if not impossible, these experts say, because the microchips that run servers have millions to billions of transistors in them. Adding a few hundred or even just tens of transistors can compromise an integrated circuit can serve attackers’ purposes and escape notice. “You can never really test every single combination on the chip. Testing a billion transistors would take a very long time. It would be very difficult to detect hardware Trojans without having some idea of what you’re looking for to begin with,” said a associate professor of electrical engineering at the University of Arkansas, co-author of a 2007 paper which described a “Hardware Threat Modeling Concept for Trustable Integrated Circuits.” Tweaking chips themselves will make them prone to manipulate data, shut down a critical function, or turn a system into a bugged phone that steals and relays vital information, the experts say. To combat the threat, the National Institute of Standards and Technology (NIST), the federal government’s technical standards laboratory, is releasing in September an inter-agency report meant to serve as the first set of best practices for government and industry to mitigate security risks to hardware included in the IT supply chain.