Speaking at the Chaos Computer Club on Tuesday, a pair of researchers demonstrated a method of eavesdropping on encrypted GSM calls and text messages by using a few cheap pay-as-you-go cellphones and a variety of open source software.
The ability to listen in on cellphone calls has been available to law enforcement agencies for a while, but even if the average person could they would have to invest in about $50,000 of hardware to do so, until now. The modern day phreaking takes advantage of security flaws in the GSM network and puts the power within the reach of almost any tech-savvy user.
By using custom firmware that they built in a few cheap Motorola cellphones, they created a bunch of cell phone "sniffers" that send real time raw cell network data back to a computer via a USB connection. By sending a target phone an SMS, they were able to determine what random network ID number belonged to the target.
All that was left was to decrypt the raw information they captured. This was easily accomplished with the use of a 2 GB rainbow table.
I’m sure with time, the software and firmware that was used in the demonstration will make it’s way into the average Joe’s hands and we will all be doomed. It’s not really modern day phreaking, back then all of us were just curious. There is no other use for this besides grabbing peoples personal communications.
Eavesdropping On GSM originally appeared on tech.nocr.at on 2010/12/31.
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