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Re: "privatizing" phones?
At 12:26 PM 7/28/96 +0200, you wrote:
If its the same standard used in digital cel phones it shouldn't take more
than 30 seconds to figure out the key.
The standard used in digital cel phones is a 120 bit key
and the crypto is basic xor which is easily broken using basic
cryptanalysis.
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>
>To: [email protected]
>Date: Sun Jul 28 12:24:57 1996
>> Even if they did change the frequency the call was on,
>> it would be a simple matter to decode how the frequency
>> change was negotiated, and "follow" the call (also easily
>> accomplished with cellular calls). Failing that, there is
>> a very limited range of frequencies allocated for cordless
>> fones, and simply re-scanning for the conversation is a
>> trivial inconvenience. //cerridwyn//
>>
>
>Most of those systems do also change the order of the transmitted data, and
>that's not limited to a few possibilities. If it's digital, they usually
>encrypt it (only weak, but hey, you normally have to find the key real
>time!)
>
>- --------< fate favors the prepared mind >--------
>Remo Pini [email protected]
>PGP: http://www.rpini.com/remopini/rpcrypto.html
>- ------< words are what reality is made of >------
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