[zapps-wg] Powers of Tau Round 38 Attestation

[Sean Bowe]

Thank you! Another fun attestation. :)

Sean

On Wed, Jan 17, 2018 at 7:47 PM, Ryan Close via zapps-wg
<zapps-wg at lists.z.cash.foundation> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA512
>
> Powers of Tau Attestation
> =========================
>
> Round: 38
> Date: 2018-1-17
> Name: Ryan Close
> Location: Florida, US
>
> Challenge:
> a58bcc60b15a6cd3d69fa7ef87b4f9d2f9be6eb2d470f66e0dadc8058a14c8ca18efaa1ca69346865d3f83bbc9fe1320e5c16f3580567963a206d337377a82ea
> Response:
> c63d895327712427bb14295d7935af4cb79bbdf9b84411684b9cd3292750f63261f3a874ec160e070cdd98bcdd2b1dd21cf20f937fb486c0ac1cab12bb3a0046
> (tweeted: https://twitter.com/closerm/status/953816452997500929 )
>
> Process
> =======
>
> UBUNTU 16.04.3 Desktop (x2)
> Rust v1.23.0 (766bd11c8 2018-01-01)
> powersoftau (github.com/ebfull/powersoftau commit
> d47a1d3d1f007063cbcc35f1ab902601a8b3bd91)
>
> I began by installing ubuntu-16.04.3-desktop-amd64.iso to a brand new
> formatted USB thumbdrive. The drive was encrypted (cryptsetup).
> I booted from this drive in VirtualBox, allowing me to update the OS,
> install the rust toolchain, and clone the needed git repository.
> The VM was shutdown, and the thumbdrive was removed to be used with an
> offline machine (no wifi, disconnected ethernet) that has no other physical
> drives.
>
> The above was performed twice, and moved to two seperate offline machines.
>
> Prior to attaching the Ubuntu OS thumbdrives to either stand-alone machine,
> each machines was booted with a live image and memtest was run.
>
> The provided challenge file was downloaded and placed on a second new and
> newly formatted thumbdrive and moved to the disconnected computer(s).
>
> For each compute node, extra entropy was introduced by letting my kids type
> at the keyboard until they felt good and satisfied, or until one of them
> accidently hit [enter].
>
> When complete, each node was verified (via verify_transform), results copied
> to the thumbdrive. Dice (and kids) were then used to choose which payload to
> report, and the result was uploaded.
>
> All 3 thumbdrives have since been securely erased, reformatted, and
> intermixed with a stash of several other similar and empty drives.
>
> Driveless stand-alone machines have since been booted and memtest run, and
> will eventually be brought back onto the network.
>
>
>
> Side Note
> ========
>
> Attempts were made to use additional hardware, OS, and software
> configurations.
>
> Raspberry Pi3 nodes were tested to see if they could be used, but do not
> have enough RAM to complete the compute job.
> PINE64 nodes were tested to see if they could be used, and while they faired
> much better than the Raspberry Pi's, they ultimately failed to complete the
> compute job aswell.
>
>
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> Version: Keybase OpenPGP v2.0.76
> Comment: https://keybase.io/crypto
>
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> =2Par
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>