From 0d490c2c616a892c1260763e3e2419e443802e20 Mon Sep 17 00:00:00 2001
From: Sean Bowe <ewillbefull@gmail.com>
Date: Wed, 20 Dec 2017 22:24:05 -0700
Subject: [PATCH] Updated kylr's attestation.

---
 0027/README.md  |   2 +-
 0027/report.asc | 197 ++++++++++++++++++++++++++++++++++++++++++++++++
 README.md       |   2 +-
 3 files changed, 199 insertions(+), 2 deletions(-)
 create mode 100644 0027/report.asc

diff --git a/0027/README.md b/0027/README.md
index cdcc33b..71ca5ae 100644
--- a/0027/README.md
+++ b/0027/README.md
@@ -1,4 +1,4 @@
-# Unknown
+# kylr
 
 Response file:
 
diff --git a/0027/report.asc b/0027/report.asc
new file mode 100644
index 0000000..4316d5f
--- /dev/null
+++ b/0027/report.asc
@@ -0,0 +1,197 @@
+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA256
+
+Powers of Tau Operational Writeup
+=================================
+
+Round: 27
+Date: 2017-12-18
+Name: kylr
+
+sha256sum challenge: d25ea47dd128c3f4c3a72a62cfd5ee6ff57e4e0be11aa3b6c61a9992daaa6e8b
+The BLAKE2b hash of `./response` is:
+c1551793 c699de37 037ea020 06adef4a
+cae97c9e 222b3e01 4f7c38b8 a8ae35fd
+e34b3c24 ec92daa6 3b56943f 45b7e2b3
+a54a56c8 256a19db 8771bdf1 a5d20b01
+
+Preparation steps
+=================
+
+Git repository: https://github.com/ebfull/powersoftau
+Commit hash: d47a1d3d1f007063cbcc35f1ab902601a8b3bd91
+
+Without announcing participation on the mailing list, I contacted Sean to get the challenge file.
+I prepared a fresh Qubes OS 4.0 rc3 install on an Intel(R) Core(TM) i7-4550U CPU.
+The actual computation were done on Fedora 25 AppVM (Linux version 4.9.56-21.pvops.qubes.x86_64 (user at build-fedora4) (gcc version 6.4.1 20170727 (Red Hat 6.4.1-1) (GCC) ) #1 SMP Wed Oct 18 00:22:42 UTC 2017).
+I installed the rust, rust-std and cargo binaries from the OS repositories:
+
+$ rpm -K -v rust-1.21.0-1.fc25.x86_64.rpm
+rust-1.21.0-1.fc25.x86_64.rpm:
+    Header V3 RSA/SHA256 Signature, key ID fdb19c98: OK
+    Header SHA1 digest: OK (3b017ab329b2f1b5f6b5da6800ef87bb2adcaac0)
+    V3 RSA/SHA256 Signature, key ID fdb19c98: OK
+    MD5 digest: OK (975bdc134bdfa1219e4614ed817cf7a6)
+$ rpm -qi rust
+Name        : rust
+Version     : 1.21.0
+Release     : 1.fc25
+Architecture: x86_64
+Install Date: Tue Dec 19 05:25:17 2017
+Group       : Unspecified
+Size        : 53667089
+License     : (ASL 2.0 or MIT) and (BSD and ISC and MIT)
+Signature   : RSA/SHA256, Fri Oct 13 21:21:16 2017, Key ID 4089d8f2fdb19c98
+Source RPM  : rust-1.21.0-1.fc25.src.rpm
+Build Date  : Thu Oct 12 20:27:34 2017
+Build Host  : buildvm-24.phx2.fedoraproject.org
+$ rpm -K -v rust-std-static-1.21.0-1.fc25.x86_64.rpm
+rust-std-static-1.21.0-1.fc25.x86_64.rpm:
+    Header V3 RSA/SHA256 Signature, key ID fdb19c98: OK
+    Header SHA1 digest: OK (53328170ec5bca69f9195071ede21b93c83c45ef)
+    V3 RSA/SHA256 Signature, key ID fdb19c98: OK
+    MD5 digest: OK (d7e405b68ac93c0642c201c269460d72)
+$ rpm -qi rust-std-static
+Name        : rust-std-static
+Version     : 1.21.0
+Release     : 1.fc25
+Architecture: x86_64
+Install Date: Tue Dec 19 05:25:14 2017
+Group       : Unspecified
+Size        : 59410932
+License     : (ASL 2.0 or MIT) and (BSD and ISC and MIT)
+Signature   : RSA/SHA256, Fri Oct 13 21:21:35 2017, Key ID 4089d8f2fdb19c98
+Source RPM  : rust-1.21.0-1.fc25.src.rpm
+Build Date  : Thu Oct 12 20:27:34 2017
+Build Host  : buildvm-24.phx2.fedoraproject.org
+$ rpm -K -v cargo-0.22.0-1.fc25.x86_64.rpm
+cargo-0.22.0-1.fc25.x86_64.rpm:
+    Header V3 RSA/SHA256 Signature, key ID fdb19c98: OK
+    Header SHA1 digest: OK (9c4a18b617594cdeb03a5467a81a931a2807c78d)
+    V3 RSA/SHA256 Signature, key ID fdb19c98: OK
+    MD5 digest: OK (66262fdef69bd1c55d9e79310ad0b1b6)
+$ rpm -qi cargo
+Name        : cargo
+Version     : 0.22.0
+Release     : 1.fc25
+Architecture: x86_64
+Install Date: Tue Dec 19 05:29:20 2017
+Group       : Unspecified
+Size        : 6441642
+License     : ASL 2.0 or MIT
+Signature   : RSA/SHA256, Wed Oct 18 03:05:07 2017, Key ID 4089d8f2fdb19c98
+Source RPM  : cargo-0.22.0-1.fc25.src.rpm
+Build Date  : Tue Oct 17 12:24:13 2017
+Build Host  : buildvm-32.phx2.fedoraproject.org
+
+I created a build of powersoftau which resulted in the following dependency hashes:
+$ pwd
+/home/user/.cargo/registry/cache/github.com-1ecc6299db9ec823
+$ sha256sum *
+53bf612c0f2839b7e764ebac65d6cb985f7c6812de399d0728038f4b1da141bc  blake2-0.6.1.crate
+560c32574a12a89ecd91f5e742165893f86e3ab98d21f8ea548658eb9eef5f40  byte-tools-0.2.0.crate
+ff81738b726f5d099632ceaffe7fb65b90212e8dce59d518729e7e8634032d3d  byteorder-1.1.0.crate
+8ff012e225ce166d4422e0e78419d901719760f62ae2b7969ca6b564d1b54a9e  constant_time_eq-0.1.3.crate
+8837ab96533202c5b610ed44bc7f4183e7957c1c8f56e8cc78bb098593c8ba0a  crossbeam-0.3.0.crate
+779015233ac67d65098614aec748ac1c756ab6677fa2e14cf8b37c08dfed1198  crypto-mac-0.4.0.crate
+e5b29bf156f3f4b3c4f610a25ff69370616ae6e0657d416de22645483e72af0a  digest-0.6.2.crate
+fceb69994e330afed50c93524be68c42fa898c2d9fd4ee8da03bd7363acd26f2  generic-array-0.8.3.crate
+56cce3130fd040c28df6f495c8492e5ec5808fb4c9093c310df02b0c8f030148  libc-0.2.32.crate
+9a2228dca57108069a5262f2ed8bd2e82496d2e074a06d1ccc7ce1687b6ae0a2  nodrop-0.1.12.crate
+514f0d73e64be53ff320680ca671b64fe3fb91da01e1ae2ddc99eb51d453b20d  num_cpus-1.7.0.crate
+c6cecc13d1871265fea9be96aa9f1cc027edacd55d2fb1fbc164e19725b88d70  pairing-0.13.0.crate
+61efcbcd9fa8d8fbb07c84e34a8af18a1ff177b449689ad38a6e9457ecc7b2ae  rand-0.3.17.crate
+13a99dc6780ef33c78780b826cf9d2a78840b72cae9474de4bcaf9051e60ebbd  typenum-1.9.0.crate
+
+I disabled swap.
+
+Procedure
+=========
+$ cargo run --release --bin compute
+<snip>
+The BLAKE2b hash of `./response` is:
+c1551793 c699de37 037ea020 06adef4a
+cae97c9e 222b3e01 4f7c38b8 a8ae35fd
+e34b3c24 ec92daa6 3b56943f 45b7e2b3
+a54a56c8 256a19db 8771bdf1 a5d20b01
+$ sha256sum ./response
+342170430d75c92c199f0606616dfa4112b2dfcb1c96b956b533e680eced8996  ./response
+
+Postprocessing
+==============
+I saved the powersoftau repo and dependency crates and the rust, rust-std and cargo rpms.
+Then I destroyed the VM.
+
+Appendix
+===
+
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diff --git a/README.md b/README.md
index 64405f0..00e36e1 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@
 24. [minezcash](./0024/) aa153027a4ef067b1a55af4932cc3edca13f30cf21060a956da09cd705e23ff968bb93fe1022c5abd45fb6ca81796b2223a574548363a0705e3c8b5b82f9b443
 25. [Fabrice Marchal](./0025/) b39c2f54485df51cd0434b0d3cbfcff7b7cc02c2e941097526cf5e605c9f8aaddd3cf9372d0e567cad8c49d7b507a47dac7510203a7f2f00b7d7810636064f06
 26. [Gareth Davies](./0026/) f2fe2ed9625ad86cee7d63cf779d6a487b47bdd5d1f33051598de29c90642eb94422ab584f5410203f949f86c56a552384d3d4507e9e7e59d2ec8a57ca472bc4
-27. [Unknown](./0027/) c1551793c699de37037ea02006adef4acae97c9e222b3e014f7c38b8a8ae35fde34b3c24ec92daa63b56943f45b7e2b3a54a56c8256a19db8771bdf1a5d20b01
+27. [kylr](./0027/) c1551793c699de37037ea02006adef4acae97c9e222b3e014f7c38b8a8ae35fde34b3c24ec92daa63b56943f45b7e2b3a54a56c8256a19db8771bdf1a5d20b01
 
 ## License