Feeds

Military chip crypto cracked with power-analysis probe

Akin to listening to safe tumblers, but with 'leccy

3 Big data security analytics techniques

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. ®

3 Big data security analytics techniques

More from The Register

next story
Obama allows NSA to exploit 0-days: report
If the spooks say they need it, they get it
Samsung Galaxy S5 fingerprint scanner hacked in just 4 DAYS
Sammy's newbie cooked slower than iPhone, also costs more to build
Putin tells Snowden: Russia conducts no US-style mass surveillance
Gov't is too broke for that, Russian prez says
Snowden-inspired crypto-email service Lavaboom launches
German service pays tribute to Lavabit
Mounties always get their man: Heartbleed 'hacker', 19, CUFFED
Canadian teen accused of raiding tax computers using OpenSSL bug
One year on: diplomatic fail as Chinese APT gangs get back to work
Mandiant says past 12 months shows Beijing won't call off its hackers
Heartbleed exploit, inoculation, both released
File under 'this is going to hurt you more than it hurts me'
Reddit users discover iOS malware threat
'Unflod Baby Panda' looks to snatch Apple IDs
prev story

Whitepapers

Securing web applications made simple and scalable
In this whitepaper learn how automated security testing can provide a simple and scalable way to protect your web applications.
3 Big data security analytics techniques
Applying these Big Data security analytics techniques can help you make your business safer by detecting attacks early, before significant damage is done.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Top three mobile application threats
Learn about three of the top mobile application security threats facing businesses today and recommendations on how to mitigate the risk.
Combat fraud and increase customer satisfaction
Based on their experience using HP ArcSight Enterprise Security Manager for IT security operations, Finansbank moved to HP ArcSight ESM for fraud management.