bugtraq - Re: Popular Net anonymity service back-doored

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Date: Fri, 22 Aug 2003 09:34:27 +0200
From: nordi <nordi@...com.de>
To: bugtraq@...urityfocus.com, full-disclosure@...ts.netsys.com
Subject: Re: Popular Net anonymity service back-doored

On Thursday, 21. August 2003 14:05, Thomas C. Greene  wrote:
> It's not secure, and claiming that it is taints anything else they may be
> doing on behalf of users. They're *still* saying it's impossible for anyone
> to intercept users' traffic or identify them.

Actually, this is absolutely not what they are saying. When you visit the 
website of the JAP project http://anon.inf.tu-dresden.de/ it says in big, red 
letters:

"Aus aktuellem Anlass weisen wir noch einmal ausdrücklich daraufhin, dass 
sich die JAP Software in Entwicklung befindet und noch nicht maximale 
Sicherheit bietet. (siehe unten ... )"

In English this means something like

"Due to recent events we explicitly inform you of the fact that the JAP 
software is still being developed and does not yet provide maximum security. 
(see below ...)"

As I said: big, red letters at the top of their main page. And when you click
that "see below" link it says there "Attention! [...] This version does NOT 
yet implement the security features described above and desired by us. But it 
does alread protect you against atackers that control the net only locally at 
one place such as [...] the owner of a mix."

So by the time you download that software you should have already read _two_ 
statements telling you that JAP is not as secure as it could be. It also 
tells you that in the current configuration, the JAP people can see all your 
traffic if they want to: Note that it says it will protect you against "the 
owner of _A_ mix". But if you take the Dresden-Dresden cascade, the JAP 
people obviously control _all_ of them. And the above statement already 
implies that in this case, JAP cannot protect you.

If you still want to use JAP, 
http://www.heise.de/newsticker/data/uma-20.08.03-000/ (in German) tells you 
how to do it securely: simply use just a single mix that is not controlled by 
the JAP project and you'll be fine. The court order is only valid for the JAP 
people, so everybody else in Germany (and elsewhere of course) can offer a 
non-backdoored mix which will make the cascade secure. This actually means 
that all cascades but the Dresden-Dresden one are secure.

MfG
nordi

-- 
Denn der Menschheit drohen Kriege, gegen welche die vergangenen wie armselige 
Versuche sind, und sie werden kommen ohne jeden Zweifel, wenn denen, die sie 
in aller Öffentlichkeit vorbereiten, nicht die Hände zerschlagen werden.
Bertolt Brecht, 1952 

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