Kobi Gurkan's attestation is as follows. See also kobi_attestation.txt and
kobi_attestation.sig in this directory.
Challenge file: https://pse-trusted-setup-ppot.s3.eu-central-1.amazonaws.com/challenge_0002_kobi
Response file: https://ppot.blob.core.windows.net/public/response_0002_kobi
New challenge file to send to participant #3: https://ppot.blob.core.windows.net/public/challenge_0003
Blake2b hash of challenge_0003:
9ff247f1 38a11751 05137ace d8c9766c
5eeccef3 5b892c62 c55eae78 7301991b
05b66649 b00c48f2 7501b30d 1538f5d8
0e2da3ed f163a978 5fba5b47 352f7d04
Hi everyone,
I finished computing a response file for the second round, following Wei Jie's participation. This contribution is partially for testing the process.
Date: 11-12 September 2019
Name: Kobi Gurkan
Location: N/A
Device(s): AWS EC2 (c5n.2xlarge) in the US.
Challenge hash:
5e72e26e 38b46d06 7b797eb5 929e18e7
eda11ae0 cf429bb8 c04af72d 8a2633b5
625f8cbe bb07b61b 510403d4 bf644357
a80ea08d 7d5cc04d 58a8aa4d 2d9084ea
Challenge file claims it's based on the response hash:
398b99a4 3f0214e0 2b7483ea 96b8ac0d
1e2aa662 7b6e9e3b 9fe0b043 2803be29
f014b567 8fd83cfa 0abee8ca 07d7655c
b6682b52 7a7965aa 1f99f02a 89afb712
Response hash:
edec0294 eb450803 ec0ef7e1 7573f238
5663016b 6b47b9cc 8c9396cb 5ed36732
fcc6b6e3 abf5f8ac 61d6761d d565b203
936e475a 00f6e9ba 047e5991 4340fd1f
Entropy sources: Natural keyboard mashing while thinking about something else.
Time taken: around 24 hours.
Side channel defences: Not a lot, besides not telling anyone what I'm going to do. cat /proc/cpuinfo claims it also has "bugs: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds".
Other defences:
* Have not used swap space.
Post processing:
* Uploaded the response file to Azure Storage.* Filled up memory with memtester.
* Reboot the VM before destroying.
Attached the attestation as a file and a GPG signature. The signature can be verified with gpg --verify kobi_attestation.sig kobi_attestation.txt.
Kobi