MIME-Version: 1.0
Reply-To: erik@q32.com
In-Reply-To: <CAJowKgL=UmJvE0KpSsa20AJBF6Ur85ghRymHY+=11VOezmaaxw@mail.gmail.com>
References: <BL2PR03MB435F510935FC7E230118AD3EE380@BL2PR03MB435.namprd03.prod.outlook.com>
	<CAAy62_K5ePDuvVn8=DtwJX6ek00Z_r4u9LyA0W11vgZmQ=zzDg@mail.gmail.com>
	<0690791a46d7a7699fc3427e92a76e9b.squirrel@mail.fairluck.net>
	<CAJowKg+dZr-PcHfCY5AO2BO8_-5QfwzvG3PuJA+mTLWw9=a-Og@mail.gmail.com>
	<461f7ce7a17c5765daadc461cdd3373c@cock.lu>
	<CAJowKg+1vUBmr7cTzUy8gAdjEWTM_+07G9Z96Bo=wd6_htgv1Q@mail.gmail.com>
	<CAJowKgJPjWb_S0jb+RJ9-90sucb=ZeU2-qrNqrVN5USTaxDjDw@mail.gmail.com>
	<CAJowKgJ+3=sOenU9EQ4eCOw8CDMoSX_L=0pUqfBKj3ZyVBXoTA@mail.gmail.com>
	<CAJowKgKqyb7DCs-yrbj4Z8Kzmgg0GCKXh+wwdSvfPHregiwdvA@mail.gmail.com>
	<CAJowKgL=UmJvE0KpSsa20AJBF6Ur85ghRymHY+=11VOezmaaxw@mail.gmail.com>
From: Erik Aronesty <earonesty@gmail.com>
Date: Mon, 17 Apr 2017 07:17:17 -0400
Message-ID: <CAJowKgK-0rqqeKkQZj0itZf79fT++OOYXJKg1pik-7mFieU=ZA@mail.gmail.com>
To: bfd@cock.lu
Content-Type: multipart/alternative; boundary=001a114fe8f622acf5054d5aef6d
Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Malice Reactive Proof of Work Additions (MR
 POWA): Protecting Bitcoin from malicious miners
Precedence: list

--001a114fe8f622acf5054d5aef6d
Content-Type: text/plain; charset=UTF-8

It's too bad we can't make the POW somehow dynamic so that any specialized
hardware is impossible, and only GPU / FPGA is possible.


Maybe a variant of Keccak where the size of the sponge is increased along
with additional zero bits required.  Seems like this would either have to
resist specialized hardware or imply sha3 is compromised such that the size
of the sponge does not incerase the number of possible output bits as
expected.

--001a114fe8f622acf5054d5aef6d
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto"><div class=3D"gmail_extra" dir=3D"auto"><div class=3D"gma=
il_quote"><br><blockquote class=3D"quote" style=3D"margin:0 0 0 .8ex;border=
-left:1px #ccc solid;padding-left:1ex"><div dir=3D"auto"><div dir=3D"auto">=
It&#39;s too bad we can&#39;t make the POW somehow dynamic so that any spec=
ialized hardware is impossible, and only GPU / FPGA is possible.</div><div =
dir=3D"auto"><div class=3D"gmail_extra"><div class=3D"gmail_quote"><blockqu=
ote class=3D"m_6005315452753799385quote" style=3D"margin:0 0 0 .8ex;border-=
left:1px #ccc solid;padding-left:1ex"></blockquote></div><br></div></div></=
div>
</blockquote></div><br></div><div class=3D"gmail_extra" dir=3D"auto">Maybe =
a variant of=C2=A0<span style=3D"background-color:rgb(255,255,255);color:rg=
b(34,34,34);font-family:&quot;helvetica neue&quot;,helvetica,&quot;nimbus s=
ans l&quot;,arial,&quot;liberation sans&quot;,sans-serif;font-size:16px">Ke=
ccak where the size of the sponge is increased along with additional zero b=
its required.=C2=A0 Seems like this would either have to resist specialized=
 hardware or imply sha3 is compromised such that the size of the sponge doe=
s not incerase the number of possible output bits as expected.=C2=A0</span>=
</div><div class=3D"gmail_extra" dir=3D"auto"><span style=3D"background-col=
or:rgb(255,255,255);color:rgb(34,34,34);font-family:&quot;helvetica neue&qu=
ot;,helvetica,&quot;nimbus sans l&quot;,arial,&quot;liberation sans&quot;,s=
ans-serif;font-size:16px"><br></span></div><div class=3D"gmail_extra" dir=
=3D"auto"><span style=3D"background-color:rgb(255,255,255);color:rgb(34,34,=
34);font-family:&quot;helvetica neue&quot;,helvetica,&quot;nimbus sans l&qu=
ot;,arial,&quot;liberation sans&quot;,sans-serif;font-size:16px"><br></span=
></div></div>

--001a114fe8f622acf5054d5aef6d--