Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Computer scientists develop 'mathematical jigsaw puzzles' to encrypt software

30.07.2013
Software remains completely functional but impervious to reverse-engineering

UCLA computer science professor Amit Sahai and a team of researchers have designed a system to encrypt software so that it only allows someone to use a program as intended while preventing any deciphering of the code behind it. This is known in computer science as "software obfuscation," and it is the first time it has been accomplished.

Sahai, who specializes in cryptography at UCLA's Henry Samueli School of Engineering and Applied Science, collaborated with Sanjam Garg, who recently earned his doctorate at UCLA and is now at IBM Research; Craig Gentry, Shai Halevi and Mariana Raykova of IBM Research; and Brent Waters, an assistant professor of computer science at the University of Texas at Austin. Garg worked with Sahai as a student when the research was done.

Their peer-reviewed paper will be formally presented in October at the 54th annual IEEE Symposium on Foundations of Computer Science, one of the two most prominent conferences in the field of theoretical computer science. Sahai has also presented this research in recent invited talks at Stanford University and the Massachusetts Institute of Technology.

"The real challenge and the great mystery in the field was: Can you actually take a piece of software and encrypt it but still have it be runnable, executable and fully functional," Sahai said. "It's a question that a lot of companies have been interested in for a long time."

According to Sahai, previously developed techniques for obfuscation presented only a "speed bump," forcing an attacker to spend some effort, perhaps a few days, trying to reverse-engineer the software. The new system, he said, puts up an "iron wall," making it impossible for an adversary to reverse-engineer the software without solving mathematical problems that take hundreds of years to work out on today's computers — a game-change in the field of cryptography.

The researchers said their mathematical obfuscation mechanism can be used to protect intellectual property by preventing the theft of new algorithms and by hiding the vulnerability a software patch is designed to repair when the patch is distributed.

"You write your software in a nice, reasonable, human-understandable way and then feed that software to our system," Sahai said. "It will output this mathematically transformed piece of software that would be equivalent in functionality, but when you look at it, you would have no idea what it's doing."

The key to this successful obfuscation mechanism is a new type of "multilinear jigsaw puzzle." Through this mechanism, attempts to find out why and how the software works will be thwarted with only a nonsensical jumble of numbers.

"The real innovation that we have here is a way of transforming software into a kind of mathematical jigsaw puzzle," Sahai said. "What we're giving you is just math, just numbers, or a sequence of numbers. But it lives in this mathematical structure so that these individual pieces, these sequences of numbers, can only be combined with other numbers in very specified ways.

"You can inspect everything, you can turn it upside-down, you can look at it from different angles and you still won't have any idea what it's doing," he added. "The only thing you can do with it is put it together the way that it was meant to interlock. If you tried to do anything else — like if you tried to bash this piece and put it in some other way — you'd just end up with garbage."

Functional encryption

The new technique for software obfuscation paved the way for another breakthrough called functional encryption. With functional encryption, instead of sending an encrypted message, an encrypted function is sent in its place. This offers a much more secure way to protect information, Sahai said. Previous work on functional encryption was limited to supporting very few functions; the new work can handle any computable function.

For example, a single message could be sent to a group of people in such a way that each receiver would obtain different information, depending on characteristics of that particular receiver. In another example, a hospital could share the outcomes of treatment with researchers without revealing details such as identifying patient information.

"Through functional encryption, you only get the specific answer, you don't learn anything else," Sahai said.

The UCLA-based researchers were funded in part by the National Science Foundation, a Xerox Faculty Research Award, a Google Faculty Research Award, an equipment grant from Intel and an Okawa Foundation Research Grant.

The UCLA Henry Samueli School of Engineering and Applied Science, established in 1945, offers 28 academic and professional degree programs and has an enrollment of more than 5,000 students. The school's distinguished faculty are leading research to address many of the critical challenges of the 21st century, including renewable energy, clean water, health care, wireless sensing and networking, and cyber-security. Ranked among the top 10 engineering schools at public universities nationwide, the school is home to eight multimillion-dollar interdisciplinary research centers in wireless sensor systems, wireless health, nanoelectronics, nanomedicine, renewable energy, customized computing, the smart grid, and the Internet, all funded by federal and private agencies and individual donors. (http://www.engineer.ucla.edu | http://www.twitter.com/uclaengineering)

For more news, visit the UCLA Newsroom and follow us on Twitter.

Matthew Chin | EurekAlert!
Further information:
http://www.ucla.edu

More articles from Information Technology:

nachricht Who can find the fish that makes the best sound?
28.02.2017 | Technische Universität Wien

nachricht Many Android password managers unsafe
28.02.2017 | Fraunhofer-Institut für Sichere Informationstechnologie SIT

All articles from Information Technology >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Safe glide at total engine failure with ELA-inside

On January 15, 2009, Chesley B. Sullenberger was celebrated world-wide: after the two engines had failed due to bird strike, he and his flight crew succeeded after a glide flight with an Airbus A320 in ditching on the Hudson River. All 155 people on board were saved.

On January 15, 2009, Chesley B. Sullenberger was celebrated world-wide: after the two engines had failed due to bird strike, he and his flight crew succeeded...

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

New technology offers fast peptide synthesis

28.02.2017 | Life Sciences

WSU research advances energy savings for oil, gas industries

28.02.2017 | Power and Electrical Engineering

Who can find the fish that makes the best sound?

28.02.2017 | Information Technology

VideoLinks
B2B-VideoLinks
More VideoLinks >>>