Delivery-Date: Sat, 28 Feb 2015 06:23:31 -0500
Return-Path: <tor-talk-bounces@lists.torproject.org>
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on moria.seul.org
X-Spam-Level: 
X-Spam-Status: No, score=-4.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,
	RCVD_IN_DNSWL_MED,T_DKIM_INVALID,T_RP_MATCHES_RCVD,URIBL_BLOCKED
	autolearn=ham version=3.3.1
X-Original-To: archiver@seul.org
Delivered-To: archiver@seul.org
Received: from eugeni.torproject.org (eugeni.torproject.org [38.229.72.13])
	(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by khazad-dum.seul.org (Postfix) with ESMTPS id 7D6BB1E04F4
	for <archiver@seul.org>; Sat, 28 Feb 2015 06:23:28 -0500 (EST)
Received: from eugeni.torproject.org (localhost [127.0.0.1])
	by eugeni.torproject.org (Postfix) with ESMTP id 8422133C84;
	Sat, 28 Feb 2015 11:23:24 +0000 (UTC)
Received: from localhost (localhost [127.0.0.1])
 by eugeni.torproject.org (Postfix) with ESMTP id 81A4033C80
 for <tor-talk@lists.torproject.org>; Sat, 28 Feb 2015 11:23:20 +0000 (UTC)
X-Virus-Scanned: Debian amavisd-new at 
Received: from eugeni.torproject.org ([127.0.0.1])
 by localhost (eugeni.torproject.org [127.0.0.1]) (amavisd-new, port 10024)
 with ESMTP id o90j8UknXvPw for <tor-talk@lists.torproject.org>;
 Sat, 28 Feb 2015 11:23:20 +0000 (UTC)
Received: from services.tengu.ch (services.tengu.ch [176.9.142.101])
 by eugeni.torproject.org (Postfix) with ESMTP id 55BD633C7A
 for <tor-talk@lists.torproject.org>; Sat, 28 Feb 2015 11:23:20 +0000 (UTC)
Received: by services.tengu.ch (Postfix, from userid 109)
 id A5986141D64; Sat, 28 Feb 2015 12:23:17 +0100 (CET)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tengu.ch; s=2015;
 t=1425122597; bh=bYIsRtW0orb0mz35aYfCy3FGGFHpQZ7VnMErjh2Km0I=;
 h=Date:From:To:Subject:References:In-Reply-To:From;
 b=JyONrEMtn4vOpqThmfNoigQvP1Pt9a5AXoyf1LN6up+AXJI1aP0cbfkh+kf4kz9sY
 H7DgTQogMQ4EHFxOd+nk9XZbamXZ7QjFAUsOGPhtaBGv6lRgIU3FMtgFtaYj3Vqrto
 ZptFXWFZiAaBtFjyePEDIxFuXe6X0gV/JLVPy2O0=
Received: from [10.10.0.128] (46-127-198-100.dynamic.hispeed.ch
 [46.127.198.100])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (No client certificate requested)
 by services.tengu.ch (Postfix) with ESMTPSA id 829811407FB
 for <tor-talk@lists.torproject.org>; Sat, 28 Feb 2015 12:23:17 +0100 (CET)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tengu.ch; s=2015;
 t=1425122597; bh=bYIsRtW0orb0mz35aYfCy3FGGFHpQZ7VnMErjh2Km0I=;
 h=Date:From:To:Subject:References:In-Reply-To:From;
 b=JyONrEMtn4vOpqThmfNoigQvP1Pt9a5AXoyf1LN6up+AXJI1aP0cbfkh+kf4kz9sY
 H7DgTQogMQ4EHFxOd+nk9XZbamXZ7QjFAUsOGPhtaBGv6lRgIU3FMtgFtaYj3Vqrto
 ZptFXWFZiAaBtFjyePEDIxFuXe6X0gV/JLVPy2O0=
Message-ID: <54F1A525.4040800@tengu.ch>
Date: Sat, 28 Feb 2015 12:23:17 +0100
From: CJ <tor@tengu.ch>
User-Agent: Mozilla/5.0 (X11; Linux x86_64;
 rv:31.0) Gecko/20100101 Icedove/31.4.0
MIME-Version: 1.0
To: tor-talk@lists.torproject.org
References: <20150227104002.AB375336A2@eugeni.torproject.org>
In-Reply-To: <20150227104002.AB375336A2@eugeni.torproject.org>
Subject: Re: [tor-talk] CloudFlare fingerprinting
X-BeenThere: tor-talk@lists.torproject.org
X-Mailman-Version: 2.1.15
Precedence: list
Reply-To: tor-talk@lists.torproject.org
List-Id: "all discussion about theory, design,
 and development of Onion Routing" <tor-talk.lists.torproject.org>
List-Unsubscribe: <https://lists.torproject.org/cgi-bin/mailman/options/tor-talk>, 
 <mailto:tor-talk-request@lists.torproject.org?subject=unsubscribe>
List-Archive: <http://lists.torproject.org/pipermail/tor-talk/>
List-Post: <mailto:tor-talk@lists.torproject.org>
List-Help: <mailto:tor-talk-request@lists.torproject.org?subject=help>
List-Subscribe: <https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-talk>, 
 <mailto:tor-talk-request@lists.torproject.org?subject=subscribe>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Errors-To: tor-talk-bounces@lists.torproject.org
Sender: "tor-talk" <tor-talk-bounces@lists.torproject.org>



On 26/02/15 14:48, amharic@uni.de wrote:
> Don't know if the issue is already through here..., but:
> 
> Isn't it possible that CloudFlare's captchas allow fingerprinting of
> tor users (looking at typical errors, re-captchas / timing), given that
> everybody of us solves them over and over again? Not necessarly done by
> CloudFlare itself, but by whoever listens to enough of the traffic?
> 
> best,
> amharic.
> 

Hmm, good question I think. Might be interesting to get some Cloudflare
insiders about that, as well as Tor community "review".
-- 
tor-talk mailing list - tor-talk@lists.torproject.org
To unsubscribe or change other settings go to
https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-talk

