From: Scott Schryvers <schryver@radiks.net>
Date: Sun, 28 Jul 1996 23:14:33 +0800
To: Remo Pini <rp@rpini.com>
Subject: Re: "privatizing" phones?
Message-ID: <199607281303.IAA17543@sr.radiks.net>
MIME-Version: 1.0
Content-Type: text/plain


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.

>-----BEGIN PGP SIGNED MESSAGE-----
>
>To: cypherpunks@toad.com
>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                            rp@rpini.com
>PGP:  http://www.rpini.com/remopini/rpcrypto.html
>- ------< words are what reality is made of >------
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