Hash of the challenge file for verification:
ac890865 8234b4f0 b8f4e3c3 0f6acc34
38d3f297 734b62b9 c7b1157f 93d7eed2
ba05c59d e663cebc 08049076 3cfbee1e
5e231123 7714661e 67b43cca 921da027
response was based on the hash:
ac890865 8234b4f0 b8f4e3c3 0f6acc34
38d3f297 734b62b9 c7b1157f 93d7eed2
ba05c59d e663cebc 08049076 3cfbee1e
5e231123 7714661e 67b43cca 921da027
Hash of the response file for verification:
c72fa936 1a701827 9f9a2d78 501dc242
53e62a2f e871f056 3c8dd530 c4ee6761
e8bad30e 2e4cabc8 21b159c8 7fc554e7
18faf6e7 b303bc5e c0865ff8 86fbea48
Blake2b hash of the new_challenge file for participant #12:
f36bf303 7f19f750 dc8edb45 30522048
4090acb5 12e96c50 149618fa 007d3b8f
d9103148 f6d5c5d2 62449ca1 b332b43c
f8d6afb2 71bf2a11 24bcf4b2 143f0477
The above new_challenge file: https://ppot.blob.core.windows.net/public/challenge_0012_20191105
Note that the file at
https://ppot.blob.core.windows.net/public/challenge_0012 may not be the
correct one; please verify the hash.
Zhiniang's attestation (from zhiniang_attestation.txt):
Attestation to response 0011
Date: 28-31 October 2019
Name: Zhiniang Peng (Security researcher, Qihoo 360)
Location: Physical location of me and the computation machine is in Beijing
Device(s): Windows 10 1903 with Ubuntu subsystem in VMWare
Challenge Blake2b:
ac890865 8234b4f0 b8f4e3c3 0f6acc34
38d3f297 734b62b9 c7b1157f 93d7eed2
ba05c59d e663cebc 08049076 3cfbee1e
5e231123 7714661e 67b43cca 921da027
URL: https://ppot.blob.core.windows.net/public/challenge_0011
`challenge` file claims that it was based on the original contribution with a hash:
ed65fac5 4967c6ee abfd8350 2eceb53c
a7ccd0bf d35353ee c5350c37 06988b8b
f1590b10 fe8388ab fbeb088c 8843fb80
4fe885d6 0bd6d8fb 7cd47eef c93b778b
Software used: https://github.com/kobigurk/phase2-bn254/commit/7ba98555fd974458273f831d6063ea77cea15853
Response Blake2b:
c72fa936 1a701827 9f9a2d78 501dc242
53e62a2f e871f056 3c8dd530 c4ee6761
e8bad30e 2e4cabc8 21b159c8 7fc554e7
18faf6e7 b303bc5e c0865ff8 86fbea48
Entropy sources: Random key mash on keyboard + /dev/random
Time taken: around 12 hours
Side channel defenses: I have not told anyone what I was going to do.
Postprocessing:
I copied the Blake2b hash from the CLI output of compute_constrained;
I uploaded the response file as "response" using SFTP to the server provided by Wei Jie.
I shutdown the VM;
I deleted the VM.