🚀 go-pugleaf

phr@telebit.com (Paul Rubin) writes:

> A co-worker of mine brought up an interesting idea.
> He thinks it might be very difficult to intercept data
> by tapping a phone line of someone using a modern high
> speed full duplex modem.  The reason is that the full
 
Well up until now, I've heard of DataTaps for 300-2400.

I have no doubts that companies have the technology to listen to the full 
bandwith, although possibly a bit 'noisy' 
> available bandwidth of the phone line is being used
> in both directions; the modems separate out the signals
> with echo cancellation, which means that the modem
> takes the phone signal and subtracts what it itself
> is sending--the difference is what the other modem
> is sending.  But a wiretapper might have an awfully
> hard time of separating the two signals.  
> 
> Any thoughts?
> 
> Sci.crypt is probably not the right place for this,
> but I felt people here might be interested in the idea.


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