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

Powers of Tau Ceremony Operational Writeup
==========================================

Round: 77
Date: 2018-03-11
Contributor: Lucas E Morales
Location: Cambridge MA, USA

Challenge (blake2b): 137a1c2a9aecb46b0ae8a286241fe42ea47dbcb09c2d679b7d59ba308e12c831e173e4ce3d14352db8c94ab90342cd68de34aeefdd8294037de0bd862ed43905
Response (blake2b): ab0c2fbd794ab26d249617cdbfd145f0a6be9c5dc9da46d8ead2b427e694d12c8f0fd6013fdc3806c538bc7f60d7240b603d92aa117f6461479fc04358c60cb3


Procedure and Details:

Compiled[1] both the rust[2] and go[3] implementations, and ran both on the
same challenge file. One of the resulting responses was selected in a random
manner such that I cannot know which was chosen. Additional entropy was
gathered by randomly picking words/phrases from books on my shelf, recording
outdoor audio, and aggregating readings of /dev/random from three machines.

Compute node was a 2007 Macbook Pro (x86_64 Intel Core 2 Duo) with the primary
intention of predating the Intel ME. It was running a Parabola GNU/Linux-libre
live image[4], and air-gapped and placed in a Faraday cage. The compute
binaries, the challenge, and ultimately the response were transferred via flash
drive. The machine will probably never be used again.

Response hash also posted on Mastodon: https://mastodon.mit.edu/@lucasem/99669377294120258
PGP public key: https://lucasem.com/pgp


[1]: Compilation was not done on the compute node.
     rustc 1.26.0-nightly (2789b067d 2018-03-06)
     cargo 0.26.0-nightly (1d6dfea44 2018-01-26)
     go 1.9.2
     gcc 7.3.0 (for the RELIC toolkit)
[2]: ebfull/powersoftau d47a1d3d1f007063cbcc35f1ab902601a8b3bd91
     compute binary (sha1) 686555685607879206d5253b527978921c3e7173
[3]: FiloSottile/powersoftau e2af113817477d26e6155f1aae478d3cb58d62c5
     compute binary (sha1) 242fc0d7e69f4112483a5ce43ba78bb64b434f31
[4]: parabola-systemd-cli-dual-complete-2017.10.17-21.39-alpha.iso
     (sha1) b2d01aa3f399ae59db5a44cffdbb6acd7bc30212

-----BEGIN PGP SIGNATURE-----
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=S7Ou
-----END PGP SIGNATURE-----