Re: [Raven] The impracticality of wiretapping

[Stuart Yeates <syeates@cs.waikato.ac.nz>]

> I think this misses the possible issues with what in the US are called
> pen register orders, in which digits dialed, in things like conference
> calls, party (3 way) calls, and other telephony services may require
> the network or gateways to understand the signalling. Encryption of
> the data channel doesn't avoid this (and the example of private
> voice channels implies that the caller couldn't be using such
> telephony services, at least not if they are implemented in the
> network).

There are is a remailer system that seeks to prevent traffic analysis,
the very thing that pen registers do:

http://www.obscura.com/~loki/remailer/mixmaster-faq.html

I see no reason why (for a modest degradation in performance) similar
techniques couldn't be applied to voice. These systems are nearly 
unique in that their security is dependent on the number of users of
the system.

stuart


-- 
--    stuart yeates <s.yeates@cs.waikato.ac.nz> aka `loam'
                       carpe noctem
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