-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Powers of Tau Operational Write-up
==================================

Round: 18
Date: 2017-11-25
Name: Neal Jayu
Location: Boston, Massachusetts, New England

Hashes
======

challenge:
c2d62e5fdff19023554f21d19b86490470ac9a2860094d10397c666f9c6fc652

response (blake2b & sha256):
    ef15cb99 7c331928 855dd7ce 42ade214
    3033be18 5be45f3e eac5b95b b12777db
    582992b0 a862c92a 1cba4e95 044c52f5
    de857776 31462a0d c51d7a4f 846b9d7e
122efac62a11da143dca24e5facd33cf61ff2597e65aa4ff09aae89fe838c045

powersoftau-master.zip:
3a6db71b0bb9d39c3f58f2d51388560ab92b139d5066eb9b66c30580262309d7147289fb598926a5d99779935b30411b075504b2ebd0488335c6e9df5bf80e00

rust-1.22.1-x86_64-unknown-linux-gnu.tar.gz:
0fd3776a7fd38cbcbffe8a257836f9f5c0d04762af3107b93b8860b98b6d92b0912b4668c973d9f647a7a74b4855a5680cab042c3389c6158efee1b4640a60de

debian-9.2.1-amd64-DVD-1.iso:
b7afe686f36f9e26ac0888ca341572d2bf1fbe70c50acb6af822cf9e04318e5a3f974ebdfd91e1706758f0f2aa1a332462f3d74ecdaf69f0061849ac595e67df

Procedure
=========

After downloading the aforementioned files to my daily Linux machine, I
checked each's sha256/512 sum against published values, or in the case
of the Rust standalone, recorded its sha512 sum and verified its
signature file against the project's PGP key from Keybase.

I burnt the Powers of Tau zip, Rust standalone installer, Debian ISO,
and Memtest86+ to DVD/CDs; and copied the challenge file to a SanDisk
USB drive.

On the compute node (see Side Channel Defences below), I booted from the
Debian DVD, installed it to a Samsung USB drive, then booted the machine
from the USB drive.

Rust and Powers of Tau were copied from CD. Both sums were re-checked on
the compute node. build-essential was installed from the Debian DVD.

I connected Ethernet to run `cargo run --release --bin new` in order to
download and configure dependencies. Ethernet was removed once complete,
and the resulting challenge file deleted.

The provided challenge file was copied over and computation began. As
input, I used the results of two minutes of 20-sided dice rolls,
followed by arbitrarily selected words from a book extolling the virtues
of laissez-faire capitalism.

One complete, a hash of the response file was taken, copied to the
SanDisk USB drive, then uploaded to the AWS bucket via my daily machine.

Side Channel Defences & Postprocessing
======================================

The compute node was a disused 7-year-old Lenovo Thinkpad T420 borrowed
from a friend without foreknowledge of my intentions for it.

I removed the hard drive prior to booting the laptop. Although I did not
have permission to remove its radio devices, I activated its hardware
switch which purportedly disabled them.

Further, during the installation of the Debian instance onto the Samsung
USB drive, I declined to install drivers for the machine's wireless devices.

The computation was performed within living quarters with no particular
precautions taken save for watching Voyager at formidable volume and
inaudibly typing the entropy sources.

After copying the response file and Blake hash to the SanDisk USB drive,
I powered off the laptop and booted into the Memtest86+ CD. I allowed
Memtest to run for two full cycles (about 1.5 hours) then powered off.

I removed power and battery from the machine and intend to leave it
powered off for the foreseable future.

Archival
========

The Debian installation media, Powers of Tau repo, Rust toolchain, and
Memtest are on DVD/CDs which I've autographed.

The Samsung USB drive containing the Debian instance, and SanDisk USB
drive with challenge and response files (and their hashes), are both
LUKS-encrypted. As such, I don't expect these to be tampered with
following the operation.

I've sealed all five of the above media in a signed and sealed envelope,
which I've locked in a safe to which I alone posses the keys. They are
available to audit upon request.
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862XXvSHdUzmcvw1+bRXqkDm+uHuMWja6DNfznle7u+1WAPU51Cef6efh5xpA0Mk
wBUx9eOkxNvTrUZuyfdclfn2ZoMAlPwN+Xtw1aS4LtT6bsxR4Vpm+GFk/l5gQHyX
8E4mcHfRp5V2Lis3bOTdUegbp7ZjRHjL/VaZeRjW3nqslzFk6cP2gp3rzylJNyID
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FMCGr1CBcZmLiNvgKbKf1H4w5dyGWwBszrnZJSuIGUZLcaPDKO8xouvB4Nk3exGC
2d/bYYpEq/P4DBiKfKnVPacxfeJTRWg32aZF4Z0D05UNW/SJ/sdUDvzyZ0LU/kdR
eZlm1wNLQjSapu+HcMnttdaGmY0FCDeIL8Ev6zUSfmjaKvRehsiw6jfjCNFY4BWq
UBZW7LgcU73KKO7e17JsL8g8pbS3XYpE7Vhzg16pjKqNHVRy
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El 25/11/17 a las 15:54, Sean Bowe escribió:
> You're next! :)
>
> Sean
>
> On Sat, Nov 25, 2017 at 1:50 PM, Neal Conner via zapps-wg
> <zapps...@lists.z.cash.foundation> wrote:
>> Hello,
>>
>> Please consider this my request to join the MPC ceremony.
>>
>> I've made the necessary preparations and can compute within 24 hours of
>> receiving the challenge file, including today if a slot is available.
>>
>> Thanks,
>>
>> Neal Conner
>> https://keybase.io/nealjayu
>>
>>

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