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: cypherpunks@toad.com Date: Sun Jul 28 12:24:57 1996

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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!)

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