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Re: header-swap isn't perfectly indistinguishable (was: problem in 3.2 "Replies")

To: mixminion-dev@freehaven.NET
Subject: Re: header-swap isn't perfectly indistinguishable (was: problem in 3.2 "Replies")
From: Zooko <zooko@zooko.com>
Date: Tue, 07 May 2002 14:33:28 -0700
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Delivered-To: mixminion-dev-outgoing@seul.org
Delivered-To: mixminion-dev@seul.org
Delivery-Date: Tue, 07 May 2002 17:37:54 -0400
In-Reply-To: Message from Len Sassaman <rabbi@quickie.net> of "Tue, 07 May 2002 14:24:38 PDT." <Pine.LNX.4.30.QNWS.0205071420350.14571-100000@thetis.deor.org>
References: <Pine.LNX.4.30.QNWS.0205071420350.14571-100000@thetis.deor.org>
Reply-To: mixminion-dev@freehaven.net
Sender: owner-mixminion-dev@freehaven.net


> Um, I'm confused. The header size is fixed. The number of hops is
> variable. Unused header slots are padded. How does this reveal any
> information?

Len:

The rest of the message describes how seeing whether a message is a swap 
message or not gives you some probabilistic indication of whether it is a 
sender-anonymous or mutually-anonymous message.  It isn't the contents of the 
message but the simple 1-bit fact of whether it is a swap or not.

I'll write more after dinner if people are still confused!

Regards,

Zooko

References:
- Re: header-swap isn't perfectly indistinguishable (was: problem in3.2 "Replies")
  - From: Len Sassaman <rabbi@quickie.net>

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