PPoT Response 0055 attestation

attestation_0055.md

Attestation to response 0055

• Date: Aug 28 - Aug 29 2020
• Name: Tyler Blaise Smith (tcrypt)
• Location: Santa Clara, CA
• Device: MacBook Pro (16-inch, 2019), Tails 4.9 on Samsung flash drive
• Software: phase2-bn254
• Commit Hash: 988b668a396b1c417b23e31438854637fa434424
• Challenge URL: https://ppotch.blob.core.windows.net/public/challenge_0055

`challenge` file contains decompressed points and has a hash:
                00d0b99a 5ccb65af a5872f82 5f2388f3
                2f6fd96e d1e58e83 cb921037 447d980d
                7bfb8a08 11d90a36 01846bbc ee2216ae
                aec90e60 e2490e5d 09ea36bf 3222840f
`challenge` file claims (!!! Must not be blindly trusted) that it was based on the original contribution with a hash:
                7f1229b8 321fd1b7 935dc9ca 5ebf1d16
                572f25c9 e936798d 3a2cfbbf 7b6c21d0
                8c681b03 6cded940 006dec27 0d51facf
                a1b24f27 698e98ba bd3555a4 6490fca7

Response:

The BLAKE2b hash of `./response` is:
                d450e7ba c92588ec 64082588 1faec73d
                486557b6 bf01dc00 50aaf601 6b2f11bd
                83dfa598 a1c87790 84806ea1 b961118f
                198f490c bac5f452 35d6048b 920a6c0b

Running time: ~12hrs

Entropy sources:

• /dev/urandom
• Ledger Nano S
• Bitcoin, Bitcoin Cash, and Ethereum block hashes

Side channel defences:

• No disk usage
• Air-gapped machine

Postprocessing:

• Tails' memory erasure
• Destroyed Tails flash drive
• Destroyed Ledger Nano S used to generate entropy

attestation_0055.md.sig

BEGIN KEYBASE SALTPACK DETACHED SIGNATURE. kXR7VktZdyH7rvq v5weRa8moFFPK6s ygsASBiWikQ129U S8SLijczeylDZVO TwGKQtBNeMJVv47 6tPmbhuAvDRWx77 hYxD282LDPfvqDJ IZRw4ZgBVaYJaXT veBnPX59iBa2SDa oeUYEUIvQjBJmk3 gGxCr5HzUGI5sOM bxYv4bI10nWrNmY i. END KEYBASE SALTPACK DETACHED SIGNATURE.