From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 281FF415 for ; Mon, 17 Apr 2017 11:17:19 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.7.6 Received: from mail-qk0-f196.google.com (mail-qk0-f196.google.com [209.85.220.196]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id CA10B13C for ; Mon, 17 Apr 2017 11:17:18 +0000 (UTC) Received: by mail-qk0-f196.google.com with SMTP id v75so18875639qkb.3 for ; Mon, 17 Apr 2017 04:17:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:reply-to:in-reply-to:references:from:date:message-id :subject:to:cc; bh=fL0WXizk6ooNOvpYtDFjMZUp99yFgNuIgiHsR6EBhZU=; b=VrDZXqDj5NoMMCX+ViyxWFaYod/gaNYL4Bcxko9l0f5T8S4XA8AJOYXpkEAdvVktKF C6YIPdFe/IvhtnUfdXSojqwtZwIIWeLETri+NYT/0y8re/bG47JndyMsZgswJjXRq8S1 70nFHCPk2t9/DwOT7W/TNicUwYnOfy6njXVqaI3CHo+6xUtrWOk2qiY05hFot1SQe2Pe CH5BHz0FVb7c68MawPsFGCEghI1kY4a1eTLk+reek9hHINUolgoc8xriQsmqqzBYxTx7 9wp29PAGvi9dKKPOXMMJO1azX+eO5cshqz/8K16TZBMIza1eJmF8lQoKrKDce2yKwKI2 VcCA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :from:date:message-id:subject:to:cc; bh=fL0WXizk6ooNOvpYtDFjMZUp99yFgNuIgiHsR6EBhZU=; b=bBADz6EXhBUrLzQeOXeJbsu99H6ABfm7dBvpJhQQ8dePtF528bdkrUOrtZiXcmu5FV yXfAFOxS6X5DkbmQT3SbCKrXg8x0pzfDsbGHNamdGdPE5TlY2Fk5NOqsFfXO2fzjoSFy GAvkPCVJ+jzyC8AfeCSHj6kvzvFUxl7E+T6EykKixdwONa2A9QnX0L2kO01cqSNY32Xz r3+jc9f27Gx01tVUKH/ABms7cJAevhokt0CA7p55EkMOMIgWEMPwDM+g4r+MsDB3phJX CCwu7t/wWwHESarqQ1HusfZ44gar7O6goivp0Qdr3t30OGtG1qdRkSz6pkz6mOHE8xJO Kw5w== X-Gm-Message-State: AN3rC/5SvbhxQW3QLnx1lX6XIyO0A4hkZdktnUp7JA04z6IZWjlhYVSx Y+TjPn2Tw0gBxSjnaOSDxlhwDesk0kRL X-Received: by 10.55.168.198 with SMTP id r189mr9192243qke.228.1492427837973; Mon, 17 Apr 2017 04:17:17 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.0.146 with HTTP; Mon, 17 Apr 2017 04:17:17 -0700 (PDT) Received: by 10.200.0.146 with HTTP; Mon, 17 Apr 2017 04:17:17 -0700 (PDT) Reply-To: erik@q32.com In-Reply-To: References: <0690791a46d7a7699fc3427e92a76e9b.squirrel@mail.fairluck.net> <461f7ce7a17c5765daadc461cdd3373c@cock.lu> From: Erik Aronesty Date: Mon, 17 Apr 2017 07:17:17 -0400 Message-ID: To: bfd@cock.lu Content-Type: multipart/alternative; boundary=001a114fe8f622acf5054d5aef6d X-Spam-Status: No, score=-1.5 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, FREEMAIL_FROM, HTML_MESSAGE, RCVD_IN_DNSWL_NONE, RCVD_IN_SORBS_SPAM autolearn=no version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org X-Mailman-Approved-At: Mon, 17 Apr 2017 14:13:58 +0000 Cc: Bitcoin Protocol Discussion Subject: Re: [bitcoin-dev] Malice Reactive Proof of Work Additions (MR POWA): Protecting Bitcoin from malicious miners X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Bitcoin Protocol Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Apr 2017 11:17:19 -0000 --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

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


Maybe = a variant of=C2=A0Ke= 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=


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