diff --git a/0002/README.md b/0002/README.md new file mode 100644 index 0000000..628cb45 --- /dev/null +++ b/0002/README.md @@ -0,0 +1,12 @@ +# Jason Davies + +* Software engineer +* Founder of [PlutoMonkey](https://www.plutomonkey.com) +* +* Mailing list post: . +* See `./report.asc` for the signed attestation. + +Response file: + +* +* diff --git a/0002/report.asc b/0002/report.asc new file mode 100644 index 0000000..b1396d1 --- /dev/null +++ b/0002/report.asc @@ -0,0 +1,75 @@ +-----BEGIN PGP SIGNED MESSAGE----- +Hash: SHA256 + +Powers of Tau Operational Writeup +================================= + +Round: 2 +Date: 2017-11-10 +Name: Jason Davies +Location: London, UK + +Challenge: 467bc84f6eb98ff956eaf12a1b7ef4dc0aff1093c7a0d5c1dfbdb85bbfffb20a43965d0daefee3fec6c1a47af69100e117b44b74371824ac8af1e33b6f91add5 +Response: 2f728af894524f55bda7a3e2c2e2db6a57a992811e90ed57456d62aead5106cdc5c97c86532d14b5185cc74d169f1b0c2c0ef1e582231ffa7936da55047c0cb2 + +Preparation Steps +================= + +Git repository: https://github.com/ebfull/powersoftau +Commit hash: 9e1553c437183540392a7231d0788318a19b18a3 +Compiler: rustc 1.23.0-nightly (d6b06c63a 2017-11-09) +Build: cargo build --release --features=u128-support +b2sum(./target/release/compute): be42f68b07c5c857bb6561a9ac2967d671ef412a71c87c2fb31776a6ab38c756736de66e554553021e129ecab45d922092873df8b71bd9a775ec05f189485198 + +I used a brand new 16GB USB stick and loaded ubuntu-17.04-desktop-amd64.iso; b2sum: 6a1c975b25b4e7f2dbf4fda84fe8b5de3ed6f4532b8c4f17e533ed11a0a8b5b9ad9fb83e8e4b89447c3a427be73f77a5f7c71b7f733fcc4bebf346e9c5c0de43. + +I reformatted a second brand new 16GB USB stick to ext4, then copied the +`challenge` file and the `target/release/compute` binary. + +Sidechannel Defences +==================== + +First of all, I lined a large cardboard box with aluminium foil in order to +make a rudimentary faraday cage. Then, I assembled an airgap compute node +using some relatively cheap parts, putting them all inside the box: + +* Motherboard: Asus H81 Pro BTC (no radio, bluetooth or speakers AFAIK) +* CPU: Intel G1840 +* Ram: 2x cheap 1GB sticks +* PSU: EVGA SuperNOVA 1300 G2 +* Monitor: old Dell TFT display +* Keyboard: generic USB keyboard + +No other peripherals or cables were connected. I placed the compute node in my +cellar (~6ft below ground level) and I remained with the node during the entire +time it was computing, without using any other devices in the vicinity (no +mobile phone etc.) The only cables coming out of the box were the two power +cables, one for the PSU and one for the monitor. + +Image: https://pbs.twimg.com/media/DOT55KUXUAEV44-.jpg:large + +Procedure +========= + +I booted the node, with "Try Ubuntu" (Live CD mode). Then, I inserted the +challenge USB stick and ran `./compute` in the USB media directory, entering +some additional entropy as requested by typing randomly on the keyboard. The +box lid was only partially opened to allow use of the keyboard and to view the +monitor at this point. After 60 minutes had passed, I looked inside the lid +and saw that the computation had completed, so I wrote down the BLAKE2b hash, +and unmounted and removed the USB stick, and then powered the node down. + +Postprocessing +============== + +I took the USB stick and transferred the response file to my laptop, and then +uploaded it using the laptop to S3 via Sean Bowe's transcript site. + +I did not destroy the compute node but I'm unlikely to use it or plug it in for +some time. +-----BEGIN PGP SIGNATURE----- + +iF4EAREIAAYFAloGQx0ACgkQuuOTgxjJDWG+vAD/ZYXU2REMoSk6YsIupwAtKfYH +TOW+4u59Jf4OLvCZrvYA/2/hFeprMh+Yt2Kqz2/QDBlvL6w2y+LkzGobzYaYZUV+ +=REXu +-----END PGP SIGNATURE----- diff --git a/README.md b/README.md index dd5812a..06cad37 100644 --- a/README.md +++ b/README.md @@ -1,3 +1,4 @@ # Powers of Tau Ceremony Attestations 1. [Andrew Miller](./0001/) +2. [Jason Davies](./0002/)