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See attestation_0057.md in this directory for Gísli Kristjánsson's signed attestation.

Hash of the challenge file for verification:

	51c5e9b0 9a72aa53 d7f6eb77 0de99db2
	f4b03a5a b2a1199e 19803c5e 7fccdfaf
	aa5b2796 37440279 4eb41fc2 1e88c53f
	8cbf3314 a65c0007 a6b8ae72 c5b8b309

response was based on the hash:

	51c5e9b0 9a72aa53 d7f6eb77 0de99db2
	f4b03a5a b2a1199e 19803c5e 7fccdfaf
	aa5b2796 37440279 4eb41fc2 1e88c53f
	8cbf3314 a65c0007 a6b8ae72 c5b8b309

Hash of the response file for verification:

	ecb889f3 2b1a07e3 ec9b76d6 9690c34f
	d1944ed6 e4459fe1 0afc7bab 0ac30bd5
	67e3e5e8 0cd84c4e 026f59eb f4021f76
	9d65c6de 0da1e527 e3a24b32 60563aa7

Blake2b hash of the new_challenge file for participant #58:

	44ba2e77 3f563893 da5c365c d93141b0
	3ac4220e b32cec9f ccd0e856 bff230b9
	65b96c82 b12ae091 9254c200 dcdfb13b
	99160633 05577912 d0ae6547 5e036015

The above new_challenge file: https://ppot.blob.core.windows.net/public/challenge_0058

Gísli Kristjánsson's attestation:

Attestation to response 0057

  • Date: Sep 11 - Sep 15 2020
  • Name: Gísli Kristjánsson (@gislik)
  • Location: Reykjavik, Iceland
  • Device: Ubuntu 20.04.1 LTS AMD EPYC 7501 16 GB memory
  • Software: snarkjs
  • Commit Hash: 4f504c8ebc5dfa0174b0368016bbb780b7b8cb21
  • Challenge URL: https://ppoteu.blob.core.windows.net/public/challenge_0057
[INFO]  snarkJS: Claimed Previous Response Hash: 
		e054da11 827bf387 5611ee78 efc0130c
		6638a706 a3aa0a5e 80c2673a 0685061e
		73c60aac 07fd0b6b 3495c965 2abd2bd3
		cfa734fe 08425804 7576562f fc221583
[INFO]  snarkJS: Current Challenge Hash: 
		51c5e9b0 9a72aa53 d7f6eb77 0de99db2
		f4b03a5a b2a1199e 19803c5e 7fccdfaf
		aa5b2796 37440279 4eb41fc2 1e88c53f
		8cbf3314 a65c0007 a6b8ae72 c5b8b309

Response:

[INFO]  snarkJS: Contribution Response Hash: 
		ecb889f3 2b1a07e3 ec9b76d6 9690c34f
		d1944ed6 e4459fe1 0afc7bab 0ac30bd5
		67e3e5e8 0cd84c4e 026f59eb f4021f76
		9d65c6de 0da1e527 e3a24b32 60563aa7

Running time: ~2 days and 16hrs

Entropy sources:

  • 2048 lines from /dev/urandom on my personal laptop
  • 2048 lines from /dev/urandom on the virtual machine
  • 10 years of winning combinations from the national lottery

Side channel defences:

  • Did not use swap file

Postprocessing:

  • Deleted virtual machine