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See saravanan_attestation_0047.md in this directory for Saravanan Vijayakumaran's signed attestation.

Hash of the challenge file for verification:

    5aac215d a5d5efcb c8badb59 67fd43b5
    b9b0a9ec f653fc5b d8604a05 869ecce3
    20d3dafc 42de3eef 05ec318f 94e08552
    c386b7e1 6a340f0f e9004f93 52fd1a61

response was based on the hash:

    5aac215d a5d5efcb c8badb59 67fd43b5
    b9b0a9ec f653fc5b d8604a05 869ecce3
    20d3dafc 42de3eef 05ec318f 94e08552
    c386b7e1 6a340f0f e9004f93 52fd1a61

Hash of the response file for verification:

    2a015b49 55e1f882 5615c666 f0e9fb0b
    8c2408c1 49682347 e7c0c3a1 9482b640
    59a63dbb 7cfc9c00 5eceb1b4 a67118ce
    d79f649f 9433437d f653427e 83955d4f

Blake2b hash of the new_challenge file for participant #48:

    5d38986e 613436f8 f29f713f 967a083c
    730a1d34 1a1d2c0f fe7c29ca 3e1b6184
    40412cff 8eeab16b 5a14bf42 1763e61b
    3cefdf6c a5715027 56331ffb 960fa61e

The above new_challenge file: https://ppot.blob.core.windows.net/public/challenge_0048

Saravanan Vijayakumaran's attestation:

Attestation to response 0047

Date: Fri Jul 10 2020 - Sat Jul 11 2020

Name: Saravanan Vijayakumaran

Location: Mumbai, India

Device: Dell Optiplex 9020, Ubuntu 18.04, Intel i7-4770 CPU, 8 cores, 8 GB RAM, Seagate 1 TB HDD ST1000DM003-1CH1

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

Challenge: URL: https://ppotin.blob.core.windows.net/public/challenge_0047

`challenge` file contains decompressed points and has a hash:
        5aac215d a5d5efcb c8badb59 67fd43b5
        b9b0a9ec f653fc5b d8604a05 869ecce3
        20d3dafc 42de3eef 05ec318f 94e08552
        c386b7e1 6a340f0f e9004f93 52fd1a61
`challenge` file claims (!!! Must not be blindly trusted) that it was based on the original contribution with a hash:
        f6124334 8acc3313 f3197405 d22b5ed1
        b552967f 4eadd830 012ad991 c151574f
        d9a8fed7 9a4a9706 bb852438 7b8180a7
        1ccec376 b69e0426 91d9a01a 0c28102b

Response:

The BLAKE2b hash of `./response` is:
        2a015b49 55e1f882 5615c666 f0e9fb0b
        8c2408c1 49682347 e7c0c3a1 9482b640
        59a63dbb 7cfc9c00 5eceb1b4 a67118ce
        d79f649f 9433437d f653427e 83955d4f

Time taken:

  • Challenge download time = 3 hours (approx)
  • Execution time = 13 hours (approx)
  • Upload time = 1 hour 16 min

Entropy Sources: Keyboard mashing by my kids, 7 yo Vidyut and 3 yo Siddhant

Side channel defences: Computer in a locked room inside a academic campus with restricted entry in a hotspot city under lockdown due to the pandemic. Cryptographically speaking, not much.

Postprocessing: Rebooted the machine. Gave the kids extra screen time.