Received: from sog-mx-2.v43.ch3.sourceforge.com ([172.29.43.192] helo=mx.sourceforge.net) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1WAhlA-0000fM-0W for bitcoin-development@lists.sourceforge.net; Tue, 04 Feb 2014 15:18:00 +0000 Received-SPF: pass (sog-mx-2.v43.ch3.sourceforge.com: domain of gmail.com designates 74.125.82.180 as permitted sender) client-ip=74.125.82.180; envelope-from=natanael.l@gmail.com; helo=mail-we0-f180.google.com; Received: from mail-we0-f180.google.com ([74.125.82.180]) by sog-mx-2.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1WAhl3-0004XZ-Os for bitcoin-development@lists.sourceforge.net; Tue, 04 Feb 2014 15:17:59 +0000 Received: by mail-we0-f180.google.com with SMTP id u57so4236005wes.39 for ; Tue, 04 Feb 2014 07:17:47 -0800 (PST) MIME-Version: 1.0 X-Received: by 10.194.108.162 with SMTP id hl2mr749199wjb.84.1391527067527; Tue, 04 Feb 2014 07:17:47 -0800 (PST) Received: by 10.194.54.10 with HTTP; Tue, 4 Feb 2014 07:17:47 -0800 (PST) Received: by 10.194.54.10 with HTTP; Tue, 4 Feb 2014 07:17:47 -0800 (PST) In-Reply-To: <20140204131723.GA10309@savin> References: <1D8E0828-D07F-46EF-9F9F-5CA83AA9DB59@plan99.net> <20140204130312.GA23538@savin> <20140204131723.GA10309@savin> Date: Tue, 4 Feb 2014 16:17:47 +0100 Message-ID: From: Natanael To: Peter Todd Content-Type: multipart/alternative; boundary=089e0102f2128e324704f1962460 X-Spam-Score: -0.6 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for sender-domain 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (natanael.l[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 T_FRT_LOLITA1 BODY: ReplaceTags: Lolita (1) 1.0 HTML_MESSAGE BODY: HTML included in message -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature X-Headers-End: 1WAhl3-0004XZ-Os Cc: bitcoin-development@lists.sourceforge.net Subject: Re: [Bitcoin-development] bitcoinj 0.11 released, with p2sh, bip39 and payment protocol support X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Feb 2014 15:18:01 -0000 --089e0102f2128e324704f1962460 Content-Type: text/plain; charset=UTF-8 Because it's trivial to create collisions! You can choose exactly what output you want. That's why XOR is a very bad digest scheme. - Sent from my phone Den 4 feb 2014 14:20 skrev "Peter Todd" : > On Tue, Feb 04, 2014 at 02:13:12PM +0100, Mike Hearn wrote: > > Hah, good point. If nobody completes the homework, I'll post a fixed > > version tomorrow :) > > Heh, here's another 25mBTC while we're at it: > > > https://github.com/opentimestamps/opentimestamps-client/commit/288f3c17626974de7eaef4f1c9b5cd93eecf40f6 > > Why is that a bad idea? > > Bonus question: What was I smoking? (hint: where do I live?) > > > On Tue, Feb 4, 2014 at 2:03 PM, Peter Todd wrote: > > > > > On Tue, Feb 04, 2014 at 01:01:12PM +0100, Mike Hearn wrote: > > > > Hello, > > > > > > > > I'm pleased to announce the release of bitcoinj 0.11, a library for > > > writing Bitcoin applications that run on the JVM. BitcoinJ is widely > used > > > across the Bitcoin community; some users include Bitcoin Wallet for > > > Android, MultiBit, Hive, blockchain.info, the biteasy.com block > explorer > > > (written in Lisp!), Circle, Neo/Bee (Cypriot payment network), > bitpos.me, > > > Bitcoin Touch, BlueMatt's relay network and DNS crawler, academic > advanced > > > contracts research and more. > > > > > > > > The release-0.11 git tag is signed by Andreas Schildbach's GPG key. > The > > > commit hash is 410d4547a7dd. This paragraph is signed by the same > Bitcoin > > > key as with previous releases (check their release announcements to > > > establish continuity). Additionally, this email is signed using DKIM > and > > > for the first time, a key that was ID verified by the Swiss government. > > > > > > > > Key: 16vSNFP5Acsa6RBbjEA7QYCCRDRGXRFH4m > > > > Signature for last paragraph: > > > > H3DvWBqFHPxKW/cdYUdZ6OHjbq6ZtC5PHK4ebpeiE+FqTHyRLJ58BItbC0R2vo77h+DthpQigdEZ0V8ivSM7VIg= > > > > > > The above makes for a great homework problem for budding > cryptographers: > > > Why did the three forms of signature, DKIM, long-lived bitcoin address, > > > and Official Swiss Government Identity fail to let you actually verify > > > you have the right code? (but make for great security theater) > > > > > > Bonus question: Who has the smallest work-factor for such an attack? > > > > > > Two rewards of 25mBTC for correct responses to each question from a > > > crypto newbie. > > > > > > > Thanks to Mike Belshe, the wallet can now send to P2SH addresses. > > > > > > Thanks > > > > > > > Generated signatures now use canonical S values. This will aid a > future > > > hard-forking rule change which bans malleable signatures. > > > > > > Soft-forking rule change. > > > > > > -- > > > 'peter'[:-1]@petertodd.org > > > 000000000000000075829f6169c79d7d5aaa20bfa8da6e9edb2393c4f8662ba0 > > > > > -- > 'peter'[:-1]@petertodd.org > 000000000000000075829f6169c79d7d5aaa20bfa8da6e9edb2393c4f8662ba0 > > > ------------------------------------------------------------------------------ > Managing the Performance of Cloud-Based Applications > Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. > Read the Whitepaper. > > http://pubads.g.doubleclick.net/gampad/clk?id=121051231&iu=/4140/ostg.clktrk > _______________________________________________ > Bitcoin-development mailing list > Bitcoin-development@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bitcoin-development > > --089e0102f2128e324704f1962460 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

Because it's trivial to create collisions! You can choos= e exactly what output you want. That's why XOR is a very bad digest sch= eme.

- Sent from my phone

Den 4 feb 2014 14:20 skrev "Peter Todd"= ; <pete@petertodd.org>:
On Tue, Feb 04, 2014 at 02:13:12PM +0100, Mike Hearn wrote:
> Hah, good point. If nobody completes the homework, I'll post a fix= ed
> version tomorrow :)

Heh, here's another 25mBTC while we're at it:

https://github.c= om/opentimestamps/opentimestamps-client/commit/288f3c17626974de7eaef4f1c9b5= cd93eecf40f6

Why is that a bad idea?

Bonus question: What was I smoking? (hint: where do I live?)

> On Tue, Feb 4, 2014 at 2:03 PM, Peter Todd <pete@petertodd.org> wrote:
>
> > On Tue, Feb 04, 2014 at 01:01:12PM +0100, Mike Hearn wrote:
> > > Hello,
> > >
> > > I'm pleased to announce the release of bitcoinj 0.11, a = library for
> > writing Bitcoin applications that run on the JVM. BitcoinJ is wid= ely used
> > across the Bitcoin community; some users include Bitcoin Wallet f= or
> > Android, MultiBit, Hive, blockchain.info, the biteasy.com block explorer
> > (written in Lisp!), Circle, Neo/Bee (Cypriot payment network), bitpos.me,
> > Bitcoin Touch, BlueMatt's relay network and DNS crawler, acad= emic advanced
> > contracts research and more.
> > >
> > > The release-0.11 git tag is signed by Andreas Schildbach'= ;s GPG key. The
> > commit hash is 410d4547a7dd. This paragraph is signed by the same= Bitcoin
> > key as with previous releases (check their release announcements = to
> > establish continuity). Additionally, this email is signed using D= KIM and
> > for the first time, a key that was ID verified by the Swiss gover= nment.
> > >
> > > Key: 16vSNFP5Acsa6RBbjEA7QYCCRDRGXRFH4m
> > > Signature for last paragraph:
> > H3DvWBqFHPxKW/cdYUdZ6OHjbq6ZtC5PHK4ebpeiE+FqTHyRLJ58BItbC0R2vo77h= +DthpQigdEZ0V8ivSM7VIg=3D
> >
> > The above makes for a great homework problem for budding cryptogr= aphers:
> > Why did the three forms of signature, DKIM, long-lived bitcoin ad= dress,
> > and Official Swiss Government Identity fail to let you actually v= erify
> > you have the right code? (but make for great security theater) > >
> > Bonus question: Who has the smallest work-factor for such an atta= ck?
> >
> > Two rewards of 25mBTC for correct responses to each question from= a
> > crypto newbie.
> >
> > > Thanks to Mike Belshe, the wallet can now send to P2SH addre= sses.
> >
> > Thanks
> >
> > > Generated signatures now use canonical S values. This will a= id a future
> > hard-forking rule change which bans malleable signatures.
> >
> > Soft-forking rule change.
> >
> > --
> > 'peter'[:-1]@petertodd.org
> > 000000000000000075829f6169c79d7d5aaa20bfa8da6e9edb2393c4f8662ba0<= br> > >

--
'peter'[:-1]@pet= ertodd.org
000000000000000075829f6169c79d7d5aaa20bfa8da6e9edb2393c4f8662ba0

-----------------------------------------------------------------------= -------
Managing the Performance of Cloud-Based Applications
Take advantage of what the Cloud has to offer - Avoid Common Pitfalls.
Read the Whitepaper.
http://pubads.g.doubleclick.net/gam= pad/clk?id=3D121051231&iu=3D/4140/ostg.clktrk
__________________= _____________________________
Bitcoin-development mailing list
Bitcoin-develo= pment@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bitcoin-de= velopment

--089e0102f2128e324704f1962460--