Feeds

Military chip crypto cracked with power-analysis probe

Akin to listening to safe tumblers, but with 'leccy

Providing a secure and efficient Helpdesk

German computer scientists have taken advantage of the powerful number-crunching abilities of graphics chips to demonstrate a practical attack on the encryption scheme in programmable chips.

Field Programmable Gate Array (FPGA) chips of the type used in embedded systems belonging to the military and the aerospace industry are vulnerable to attacks based on analysing power usage during the power up sequence of the chip. The side-channel attack against the bitstream encryption mechanism used by Virtex 4 and Virtex 5 chips from Xilinx allowed researchers from the Ruhr University to extract a key used to decrypt configuration instruction files. The technique uncovered secret keys by analysing fluctuations in power consumption during the decryption process.

Only one power up sequence needs to be monitored. The subsequent number crunching took up to nine hours, in the case of the more advanced Virtex 5 chip, or six hours in the case of the earlier Virtex 4.

The approach is akin to listening to the clicks coming from the tumblers of a safe to work out a combination, but using variations in power consumption rather than sound.

Identical decryption keys are normally used in all FPGAs in a mass-produced product, so the attack opens the way up towards the creation of counterfeit kit that would be difficult to tell apart from the real thing, or even the surreptitious introduction of hardware Trojans, the researchers warn. It might be possible to introduce revised instructions that compromised devices would accept as genuine because they had been signed with the correct digital key.

Access to the key allows cloning and manipulating a design, which has been encrypted to protect the intellectual property and to prevent fraud. As a consequence, the target product faces serious threats like IP theft and more advanced attacks such as reverse engineering or the introduction of hardware Trojans.

To the best of our knowledge, this is the first successful attack against the bitstream encryption of Xilinx Virtex 4 and Virtex 5 reported in the open literature.

The attack could be carried out with off-the-shelf hardware at moderate effort.

Countermeasures against such side-channel attacks have already been applied in some high-security devices, such as smartcards for banking or pay-TV applications, but not previously though necessary for complex semiconductor circuits, such as FPGAs cracked by the German team.

More details on the research by Amir Moradi, Markus Kasper and Christof Paa from the Horst Gortz Institute for IT-Security at Ruhr University can be found in a paper, On the Portability of Side-Channel Attacks, here. ®

New hybrid storage solutions

More from The Register

next story
Apple Pay is a tidy payday for Apple with 0.15% cut, sources say
Cupertino slurps 15 cents from every $100 purchase
Google recommends pronounceable passwords
Super Chrome goes into battle with Mr Mxyzptlk
Reddit wipes clean leaked celeb nudie pics, tells users to zip it
Now we've had all THAT TRAFFIC, we 'deplore' this theft
YouTube, Amazon and Yahoo! caught in malvertising mess
Cisco says 'Kyle and Stan' attack is spreading through compromised ad networks
TorrentLocker unpicked: Crypto coding shocker defeats extortionists
Lousy XOR opens door into which victims can shove a foot
Greater dev access to iOS 8 will put us AT RISK from HACKERS
Knocking holes in Apple's walled garden could backfire, says securo-chap
Microsoft to patch ASP.NET mess even if you don't
We know what's good for you, because we made the mess says Redmond
NORKS ban Wi-Fi and satellite internet at embassies
Crackdown on tardy diplomatic sysadmins providing accidental unfiltered internet access
prev story

Whitepapers

Providing a secure and efficient Helpdesk
A single remote control platform for user support is be key to providing an efficient helpdesk. Retain full control over the way in which screen and keystroke data is transmitted.
Top 5 reasons to deploy VMware with Tegile
Data demand and the rise of virtualization is challenging IT teams to deliver storage performance, scalability and capacity that can keep up, while maximizing efficiency.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.
Secure remote control for conventional and virtual desktops
Balancing user privacy and privileged access, in accordance with compliance frameworks and legislation. Evaluating any potential remote control choice.