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0039_wanseob_response

README.md

See wanseob_attestation_0039.md in this directory for Wanseob Lim's signed attestation.

Hash of the challenge file for verification:

    ac95544f 0e1eab30 0cbd826c 7ce0ccf5
    58559b95 cf450ed1 0f472063 fa50bb5e
    159734c0 a50cdd1a 8413eb92 a7b4947e
    6e66b8d0 cdb3a19c 85897e42 ee1811e1

response was based on the hash:

    ac95544f 0e1eab30 0cbd826c 7ce0ccf5
    58559b95 cf450ed1 0f472063 fa50bb5e
    159734c0 a50cdd1a 8413eb92 a7b4947e
    6e66b8d0 cdb3a19c 85897e42 ee1811e1

Hash of the response file for verification:

    ed29ba79 b1392ba7 4ff572b8 6ed743b9
    3b94da14 e54eb4a5 4d2fa6f0 cbd47b99
    13516c95 f53b6a07 845676c5 1b081f2d
    64a14d26 0809d9bb 2db1bf8d 9bccf584

Blake2b hash of the new_challenge file for participant #40:

    79043f5f 7a2e81a2 e7aca5bf c02a375f
    6b3beb0c 5aa7e3f8 b942201a f3e0d43e
    b33efd3a 10b10323 8a93eaad 3462180e
    56eea585 e4f30715 3df06e81 d6150275

The above new_challenge file: https://ppot.blob.core.windows.net/public/challenge_0040

Wanseob Lim's attestation:

Attestation to response 0039

Date : Tuesday May 26th - Wednesday May 27th 2020

Name : Wanseob Lim

Location : Seoul, South Korea

Device : AMD Ryzen 3950x(16 cores) Desktop with Ubuntu 20.04 Live USB stick(on Samsung 64GB USB) + 256 GB Sandisk Extreme Pro 0

Commit hash : bf852c168676a7afc5dd17b47ff9b8f394aeab8a

Challenge : URL: https://ppotkr.blob.core.windows.net/public/challenge_0039 Calculating previous contribution hash... `challenge` file contains decompressed points and has a hash: ac95544f 0e1eab30 0cbd826c 7ce0ccf5 58559b95 cf450ed1 0f472063 fa50bb5e 159734c0 a50cdd1a 8413eb92 a7b4947e 6e66b8d0 cdb3a19c 85897e42 ee1811e1 `challenge` file claims (!!! Must not be blindly trusted) that it was based on the original contribution with a hash: 036438ed c68d3a36 6ba0517f 5b4a0e79 f6d5efe5 6fd2514a bb674c9d f6126eda 854fd11b eb274969 095149d7 7de76179 45176503 158beaf9 fc6f9fa5 9aef2aaf

Response : The BLAKE2b hash of `./response` is: ed29ba79 b1392ba7 4ff572b8 6ed743b9 3b94da14 e54eb4a5 4d2fa6f0 cbd47b99 13516c95 f53b6a07 845676c5 1b081f2d 64a14d26 0809d9bb 2db1bf8d 9bccf584

Time taken : Download: about 49 minutes Preparation: about half a day Execution: 3 hours 11 minutes 25 seconds. Upload: 1 hour 10 minutes 34 seconds

Entropy Sources : Latest Ethereum hash and /dev/urandom

Side channel defences : * Turned off the internet

  • Used a Live Ubuntu Image on a USB
  • Went out of the room

Postprocessing : * Rebooted the machine

  • Formatted used usb sticks

(Additional) Video recording : https://youtu.be/wZaqiTldLuk