Another GSM encryption technique falls to researchers

GSM logoLate December saw the announcement that the A5/1 encryption technique used by GSM cellphones was vulnerable to a new attack, raising questions about how the cellular industry would respond. There was some thought that the transition to 3G service, which is already well under way, could be relied on to limit the risk of attack, as 3G communications uses a different encryption system. For anyone planning on that response, however, this week's news is not so good: researchers have described an attack on 3G's KASUMI system that requires only a few hours on a typical PC.

Unfortunately, a full MISTY encryption is apparently computationally expensive, making it less than ideal for an application where time and processing power are in short supply. The KASUMI algorithm was developed specifically to simplify the MISTY system, and make it "faster and more hardware-friendly," in the words of the new study's authors. Supposedly, the simplifications didn't reduce the security of the protocol, but the new research suggests otherwise.

The math behind the attack is rather complex but, distilled down, relies on sending multiple inputs through the encryption process that differ by known values, and look for pairs of pairs that show key similarities. These similarities allow the authors to determine when related encryption keys are being used, and then identify some of the bits in these keys. According to the paper, "our unoptimized implementation on a single PC recovered about 96 key bits in a few minutes, and the complete 128 bit key in less than two hours." That should meet almost nobody's standard of secure.

Source: ars technica

Tags: 3G

Comments
Add comment

Your name:
Sign in with:
or
Your comment:


Enter code:

E-mail (not required)
E-mail will not be disclosed to the third party


Last news

 
You can use a security key instead of having a code sent to your phone
 
Adobe says that the AI can now achieve the intended result in seconds
 
A new security protocol replacing the aging WPA2
 
Download and install at your own risk, of course
 
More iPhone parts likely to be produced by Samsung
 
Starting on Friday, video views on YouTube will start to be counted by the Official Charts Company
 
LG has already announced two new V-series members in 2018
 
The method is blocked and the hack doesn’t work, it adds
The Samsung Galaxy A5 (2017) Review
The evolution of the successful smartphone, now with a waterproof body and USB Type-C
February 7, 2017 /
Samsung Galaxy TabPro S - a tablet with the Windows-keyboard
The first Windows-tablet with the 12-inch display Super AMOLED
June 7, 2016 /
Keyboards for iOS
Ten iOS keyboards review
July 18, 2015 /
Samsung E1200 Mobile Phone Review
A cheap phone with a good screen
March 8, 2015 / 4
Creative Sound Blaster Z sound card review
Good sound for those who are not satisfied with the onboard solution
September 25, 2014 / 2
Samsung Galaxy Gear: Smartwatch at High Price
The first smartwatch from Samsung - almost a smartphone with a small body
December 19, 2013 /
 
 

News Archive

 
 
SuMoTuWeThFrSa
 123456
78910111213
14151617181920
21222324252627
28293031   




Poll

Do you use microSD card with your phone?
or leave your own version in comments (11)