Hash of the challenge file for verification:
ad1d6f7d 105fe751 56ae95ab 9c289094
5aca0552 61902a80 eb6b5f7c 98996f80
5575ba0d 05dfddc8 df75506c b22911a4
182a852b 4ee4953d 25c37841 cee60084
response was based on the hash:
ad1d6f7d 105fe751 56ae95ab 9c289094
5aca0552 61902a80 eb6b5f7c 98996f80
5575ba0d 05dfddc8 df75506c b22911a4
182a852b 4ee4953d 25c37841 cee60084
Hash of the response file for verification:
ba95f869 eabeb87c c1c55f21 6aed17ef
e96a832c 1571dcb3 556b85e0 434c45b2
0220dc2b 67af7012 12354f58 71b40d4a
0887b7b4 c485d2f3 43c65624 12ca5c31
Blake2b hash of the new_challenge file for participant #16:
1dcfa3a3 2135ab8d 1adca012 b01a4e63
42be7688 022183fb 0e28d1ac 762dcf3a
4bf2cf25 71f83624 c37cbaa5 30676bd8
0fa00411 c6e586e5 47a70d95 4085d4cd
The above new_challenge file: https://ppot.blob.core.windows.net/public/challenge_0016
Anonymous Cryptographer's attestation (signed by Wei Jie):
**Date:** 3 - 4 December 2019
**Device(s):**
persistent disk (wipe out disk after finishing)
Google compute engine: Machine type
n1-highcpu-8 (8 vCPUs, 7.2 GB memory)
CPU platform: Intel Haswell
ubuntu-1404-trusty-v20191107
**Entropy sources:** For random seed: sha512(random photos of Christmas tree and and various toys in the floor) concatenated with random key mash on keyboard.
**Side channel defenses:** 2FA was activated on the Google Account, and the VM wasn't used for anything else.
**Post-processing:**
- 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.
- Verified with Wei Jie that the uploaded file has the expected Blake2b digest
- Working folder gets deleted `rm -r tau`
- Wipe out disk `shred -v --random-source=/dev/urandom -n10 /dev/sda2`
- All logs get cleared `truncate -s 0 /var/log/*log`
- History gets cleared `history -c`
- Shutdown the VM
- Delete the VM