Powers of Tau Operational Writeup
=================================
Date: 2018-01-06
Name: Brian Gomes Bascoy
Location: Seattle, WA, USA

Challenge:
bdfadf02e016d8fac9a77659ce4bf6e066d07c168c69d27f3132344c26dc3eb657b77ce
2327f5a3483f5d33d5d391757a23a4a09a88f02868353aa65cdcfcb3a
Response:
02dc27a0df3d1a838bc1087774c20d7ce61a4a467ce1e0ac8cac03d2a7c91c8d6cd5485
7873d4b7bc00500b1d6f85d917bd7aa2d92a659f4ac3a195aaa66cf36


Preparation Steps
=================
Host system:
Linux yuri 4.14.11-1-ARCH #1 SMP PREEMPT Wed Jan 3 07:02:42 UTC 2018
x86_64 GNU/Linux

Guest system:
Linux debian 4.14.0.2-amd64 #1 SMP Debian 4.14.7-1 (2017-12-22) x86_64
GNU/Linux

On 2018-01-05 I installed Debian "buster" (I had to use testing for the
cargo package) with encrypted LVM on a VirtualBox VM with a 8GB fixed
size virtual HD. I kept the laptop (a ThinkPad T450s that I bought
about two years ago) with me the whole time here in my apartment. The
host OS is Arch Linux without swap space, which I had fully upgraded a
few hours before. To the best of my knowledge I never had any kind of
security incident with this computer, which I have used for instance to
do valuable cryptocurrencies transactions and also to manage banks and
investments accounts, so I'm relatively confident that it's somewhat
trustworthy.

Used apt-get to install unzip, rustc, cargo and all its dependencies.
Downloaded the current Powers of Tau master branch with wget from
GitHub (https://github.com/ebfull/powersoftau/archive/master.zip).


Side Channel Defenses
=====================
It's not much but: I left my cell phone far away from the basement room
where I had my laptop, disabled the wifi kernel modules, and unplugged
the power adapter before starting the process. I didn't use any other
electronic device (not even my lovely mechanical keyboard ^_^).


Procedure
=========
Sean Bowe sent me a link to a page hosted on an Amazon S3 instance with
a link to the challenge file. I downloaded it using the host system at
11:20 AM (PST) and then I disconnect it from the Internet and unplugged
the charger. I started the guest system VM and used scp to copy the
challenge. I ran cargo, introduced more than a minute of random
keyboard typing, then waited for almost 4 hours for the process to
complete (unfortunately I had to charge the batteries after the 3rd
hour for about 30 minutes). When it finished I took a picture of the
hash with a Canon EOS, and copied the response file using scp to the
host system.


Postprocessing
==============
Deleted all the VM files with shred, rebooted and then ran Lenovo's
Diagnostic tool on CPU, RAM, HDD and motherboard, to cleanup registers,
memory, caches, buffers, etc.

I verified the photograph of the response's BLAKE2 checksum, and after
posting this report I will check it again from the mailing list archive
using different devices.


SHA256SUMS
==========
a3a5b581169394e68a0d566e72df3a6a4bd3c54e7e75c87b01c4c981401dcfd4  virtu
albox-5.2.4-1-x86_64.pkg.tar.xz
a8e8aff5c5709657ec40b1a8eb5c58c9f543386532261bdd4a30ca3ca462e3e4  virtu
albox-host-modules-arch-5.2.4-6-x86_64.pkg.tar.xz

41670305b5468693e4fb17f8a695ba1fe5385a088d7fc2b1efb81b956f68c5c1  debia
n-testing-amd64-netinst.iso

2f186a48f45c31844b8288d9ee403b97ff558735478a215c49bb13652fe2fdc5  cargo
_0.23.0-1_amd64.deb
88a2e940bd7573c62ee3a979f823c47c2e252ef54ec6a885fdcac56705cd1a8a  rustc
_1.22.1+dfsg1-1_amd64.deb
d0d8d9ab3e55b139a207c43b7a15faec17faf7b0da77f9b844ffd2d2c03b68e6  unzip
_6.0-21_amd64.deb

0902301defc0705d3d824d9ec17382f40785cb9ce84502ee13b774840752def7  maste
r.zip


Debian ISO's SHA256SUMS.SIGN
============================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=Sqtk

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