Round 19 response

[Petr Korolev]

Attestation to response 0019
============================

**Date:** 8 - 9 January 2020

**Name:** Petr Korolev

**Location:** Dacha under Zvenigorod, Russia

**Device(s):** Personal laptop: MacBook Pro (15-inch, 2018) (2,6 GHz 6-Core Intel Core i7, 16 GiB memory) running on macOS 10.15.2 (19C57).

**Challenge:**

Hash of the `challenge` file for verification:
```
 729cd42c 9fa0328d d3faa58e 5fdd80b9
 94270562 af70a380 f017bb9a 6099d742
 8865b173 824c7547 10d2ccf0 667508f4
 e7bf5f33 30660b5b 1dda4364 256926fc
```

**Software used:** https://github.com/kobigurk/phase2-bn254/commit/bf852c168676a7afc5dd17b47ff9b8f394aeab8a

**Response:**

Hash of the `response` file for verification:
```
 98900cd9 b12a8619 aaa134ee e1a20ec8
 89acc1af ca5a8131 c8b92c47 60f3b6b2
 6132ec96 31c7e735 4547252f 2d578d29
 3fcb91af d797edd1 b28fef9e 7105b5b8
```

An image of the hash from the ceremony was uploaded to twitter https://twitter.com/skywinder/status/1217380683489759232

**Entropy sources:** My entropy cocktail recipe: took random words and numbers from people, has them, and concat put random symbols in between.

**Time taken:** ~ 20 hours

**Side channel defenses:** Running in isolation area (on dacha). Closed all the applications, services, and daemons on the laptop and switched off the connection to the internet.

**Postprocessing:**

- Rebooted the laptop, then transferred the files to an external hard drive, plugged that into a different laptop, and uploaded them to the remote server.

Privacy Matters, enjoy!