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References: <6D3F4899-773C-44A4-90E8-F9973C337B3D@gmail.com>
From: Georg Koppen <gk@torproject.org>
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Date: Fri, 8 Jan 2016 10:03:22 +0000
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Subject: Re: [tor-talk] Chaum Fathers Bastard Child To RubberHose ...
 PrivaTegrity cMix
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Bryan Ford:
> Travis Biehn wrote:
>> It was surprising (to me) that Chaum should be the one to produce the =
first
>> of the modern 'solving the key escrow problem' algorithms. Academia ha=
s
>> been ignoring this particular problem for quite a while - I expect tha=
t
>> more proposed solutions will follow, solutions that will be more diffi=
cult
>> to prove insecure=E2=80=A6
>=20
> Not quite true.  Although it=E2=80=99s not a =E2=80=9Chot topic=E2=80=9D=
 in academia, we and a few others have written a few papers exploring pri=
vacy-preserving approaches to controlled, limited data collection for law=
 enforcement.  For example:
>=20
> - =E2=80=9CRestructuring the NSA metadata program=E2=80=9D: http://outs=
ourcedbits.org/2014/03/10/restructuring-the-nsa-metadata-program/
> - =E2=80=9CSecure protocols for accountable warrant execution=E2=80=9D:=
 https://freedom-to-tinker.com/blog/felten/secure-protocols-for-accountab=
le-warrant-execution/
> - =E2=80=9CCatching Bandits and Only Bandits: Privacy-Preserving Inters=
ection Warrants for Lawful Surveillance=E2=80=9D: http://dedis.cs.yale.ed=
u/dissent/papers/bandits-abs
>=20
> None of these papers really suggest or call for =E2=80=9Ckey escrow=E2=80=
=9D or =E2=80=9Cbackdoors=E2=80=9D, especially not against general-purpos=
e end-to-end encryption or mobile devices.  But even so, this line of res=
earch understandably tends not to get much love either from many die-hard=
 privacy purists. :)

https://anon.inf.tu-dresden.de/publications/KWF2006ETRICSRevocableAnonymi=
ty.pdf

is probably one, in the context of the AN.ON/JonDonym system. See as
well: http://freehaven.net/anonbib/cache/sassaman-pet2008.pdf

Georg


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