85 lines
3.3 KiB
Plaintext
85 lines
3.3 KiB
Plaintext
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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Powers of Tau Operational writeup
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=================================
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Round: 1
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Date: 2011-11-10
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Name: Andrew Miller
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Location: Champaign, Illinois
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Challenge: (genesis)
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ce00f2100dd876fdff8dd824f55307bcb72d724f29ff20b9e0760f3a65e5588a65eaed57cbc61697111ae1f4cc7da2e62a85311c2ae683a041fb872b891c68dc
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Response:
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15729e0edc4201dc5ee6241437d926f614cb4214ff1b9c6fbd73daf401639f7a4238cf04bc94edac9f2ad037003daab9a4408ba7c62a4413dc2a0ddd683bd719
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./response-2017-11-10-amiller
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Preparation steps
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=================
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I used Sean’s powersoftau rust repo, commit
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9e1553c437183540392a7231d0788318a19b18a3
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I followed instructions online for building portable rust binaries,
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and so I ran
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```
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cargo build --target=x86_64-unknown-linux-musl --release --features=u128-support --bin=compute
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```
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Compiler: rustc 1.23.0-nightly (02004ef78 2017-11-08)
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I copied the resulting binary to a freshly formatted USB stick I had.
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b2sum:
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9059a0a64f5021c36df630ca48ac40674862b2fea14f4843ff2150256b95162ac4d6d1621d2dd3f5d0d1c604ad8e581c0ff449d2449140380eab075a9b83c960
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./target/x86_64-unknown-linux-musl/release/compute
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I also rummaged through my shelf of several USB sticks, and found one
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that happened to be a Linux Mint 18 USB bootable disk, so I used that
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for my operating system.
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Sidechannel defenses
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====================
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I used an airgap compute node, a Dell Inspiron that I’ve had for about
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a year now (Actually this is a computer I bought last year for
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dress-rehearsals in the Zcash Sprout param generation ceremony).
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I unplugged all the computer’s hard drives, and detached its
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wifi/bluetooth radios. I booted the computer from the Linux Mint
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livecd usb stick, and then also copied the binaries into RAM. The
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compute node was located in my bedroom, and I attended it for the ~1hr
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duration of the compute process.
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Image: https://pbs.twimg.com/media/DOSZz4FXkAEKC7N.jpg:large
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Postprocessing
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==============
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After compute was finished, I took a cell phone picture of the blake2b
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hash of the response. I then copied the response file to the USB stick
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containing the binaries, and then I unplugged the compute node. Using
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my personal laptop, I posted the blake2b hash to the #mpc chat and
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uploaded the response file to s3.
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The repsonse file is hosted here for now, though I expect we'll
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mirror it elsewhere later:
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https://s3.amazonaws.com/socrates1024_a/response-2017-11-10-amiller
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I did not destroy the compute node and do plan to use it again,
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although I'm going to leave it unplugged for several days.
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