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See dimitris_attestation.txt in this directory for Dimitris Apostolou's signed attestation.

Hash of the challenge file for verification:

    f71e9315 058c1c88 ba4cd22e 01f86242
    d81b5e74 de829ad8 8bd7ecef 475ca3ce
    d59eaa77 7e2ebfd3 14c38bde 84a47ebf
    c3143252 9c978b84 b25cddf7 a6212371

response was based on the hash:

    f71e9315 058c1c88 ba4cd22e 01f86242
    d81b5e74 de829ad8 8bd7ecef 475ca3ce
    d59eaa77 7e2ebfd3 14c38bde 84a47ebf
    c3143252 9c978b84 b25cddf7 a6212371

Hash of the response file for verification:

    1488bd2d 1acf5ec7 c3636ff2 ba23cf99
    7cf9ef7e eee6af0f 98150c11 e1c18b14
    6c7225ed 6cecbe0d 749b8d2f b96a3139
    04ec9b9c d5035958 f77dae70 75d3326e

Blake2b hash of the new_challenge file for participant #29:

    aa470426 518e2a2e 287b1b18 92767431
    5646e93d d4f2ec4b d5beb54e 0d78f331
    9e98e46a 0d50dcf7 3f06bb7e 7258a752
    635d176e 8101350d 3d61108a 58e08962

The above new_challenge file: https://ppot.blob.core.windows.net/public/challenge_0029

Dimitris' attestation:

Attestation to response 0028
----------------------------

*Date*: Mon Mar 23 2020 - Wed Mar 25 2020
*Name*: Dimitris Apostolou
*Location*: Voula, Greece
*Device*: Apple MacBook Pro 15,1 with macOS 10.15.4 (19E264b)
*Commit Hash*: bf852c168676a7afc5dd17b47ff9b8f394aeab8a
*Challenge*:
URL: https://ppoteu.blob.core.windows.net/public/challenge_0028

challenge file contains decompressed points and has a hash: f71e9315 058c1c88 ba4cd22e 01f86242 d81b5e74 de829ad8 8bd7ecef 475ca3ce d59eaa77 7e2ebfd3 14c38bde 84a47ebf c3143252 9c978b84 b25cddf7 a6212371 challenge file claims (!!! Must not be blindly trusted) that it was based on the original contribution with a hash: 379ecd36 fd2650c0 2196c9b4 13ea0f28 2d5545c9 ed270075 fd5b5000 60a41e67 8d5b75fc b22221b4 2636b741 0c45d9a1 68a4bf12 a6e91efc 14e09be2 20780990


*Response*:

The BLAKE2b hash of ./response is: 1488bd2d 1acf5ec7 c3636ff2 ba23cf99 7cf9ef7e eee6af0f 98150c11 e1c18b14 6c7225ed 6cecbe0d 749b8d2f b96a3139 04ec9b9c d5035958 f77dae70 75d3326e


*Time taken* 
Download: About 10 hours
Execution: About 10 hours
Upload: About 31 hours

*Entropy Sources*: Keys smashing

*Side channel defences*: Disabled WiFi
*Postprocessing*: Rebooted the machine