Re: 'Phone Tapping' Modem Traffic ?

> How difficult is it for them to 'decode' my modem [to ISP] traffic ?

On modern modems at 9600 bps and up it's fairly hard. The traffic in both directions uses the full bandwidth, and each end does echo cancellation, subtracting out a time-delayed copy of what it sent, to recover the other end's signal. If you're sniffing in the middle without a copy of what's been sent from either end, I suppose it's possible with a sufficiently sophisticated signal processor, but it's not something you could do by plugging in an off the shelf modem and tweaking settings like you could do at 1200 bps.



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John Levine
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