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Hacking DECT
Quite an old story dating back to December 2008, some how I must have missed it. DECT (Digital Enhanced Cordless Telecommunications) is a standard used for cordless/wireless telephones widely used in homes and businesses across the world. (UK frequency: 1880 MHz–1900 MHz)
A project know as deDECTed.org run by a group of German university students has managed to circumvent DECT’s security implementations. Not by cracking the secret DECT Standard Authentication Algorithm (DSAA) but instead they realised that sometimes DECT phones used no encryption or authentication at all when communicating with their base station
When no encryption is used by a DECT phone the researchers found that with a modified 23euro PCMCIA DECT wireless card they could capture and record all audio data passively using their custom built Linux drivers.
I have a DECT phone at home as I’m sure most people now a days do. It’s quite a scary thought to think that with enough technical knowledge any one can listen to your telephone conversations remotely and passively. I’m sure they would be nothing interesting to be heard on my phone, apart from the occasional take away order, however occasionally I do contact my ISP or bank and provide them with my authentication details to access my accounts.
For more information: https://dedected.org/trac
Sources: http://www.theregister.co.uk/2008/12/31/dect_hack/
https://dedected.org/trac/raw-attachment/wiki/25C3/talk-25c3.pdf


5 Responses to “Hacking DECT”
1337speak said...
Interesting and scary stuff, I as you said like many other have DECT cordless phones at home, and also ring the Bank, ISP, and other places where I am required to give information to authenticate myself.
I am sure that the companies will (hopefully) make new implementations to ensure that the phones always use DSAA for any communication.
Jonny0stars said...
I now know what you mean by a DECT phone, funnily enough I used to have a old BT handheld when I was about 11 or 12.
I found a little trick which was pretty neat, I used to disconnect the base unit (power off at the wall) then press the dial button (within a few seconds) and normally pick up other peoples conversations.
I wasn’t aware of the legal implications at the time, I soon stoped as I found most peoples conversations where very boring (no conspiracy theory unfortunately).
admin said...
Now that you mention it, I remember a phone call I had once from an elderly lady while working at a telecoms company. She rang up and was very upset and distraute due to the fact that every time she picked up her phone some one could listen/talk in her conversations and vise versa. When the other guy was on a conversation and she picked up the phone she could listen/talk on his conversation. The guy was very abusive as he must have been sick of some old lady being confused about what was going on every time he had a phone call. While she was on the phone to me, you could hear him swearing at her and telling her to f off, at the time I had no clue that she probably had a DECT phone, I think in the end I just sent out an engineer to have a look at the wiring. Just goes to show how some DECT phones must be really insecure.
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