66 lines
2.8 KiB
Plaintext
66 lines
2.8 KiB
Plaintext
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA256
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Powers of Tau Operational writeup
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=================================
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Round: 13
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Date: 2017-11-21
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Name: Tommaso Pellizzari
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Location: Italy
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Challenge:
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75cf81add83e814a388d1392836484c81002fe2d8db2c0649077fa6e561acd62ea714d6a28776e0f83c1ead695ab30a58740341c8933cadfe67916256f6b4c29
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0c7f812a2ccbdcb7161cb1149ed5916a836074508b889ec6bbc53b750cbdc1dd
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Response:
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8ee7f56bb57cc1f8bda9a43c193a7d8ace49aeced57350e17e3972438d837b0c5fcf2444abe1e77bd8d043c9066a9da96898571f279871396ac50d2908d30c66
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Preparation
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=================
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I created a very plain vanilla set-up starting from https://github.com/ebfull/powersoftau, commit
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d47a1d3d1f007063cbcc35f1ab902601a8b3bd91
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I built 'compute' binary running:
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cargo build --release --bin=compute
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rustc 1.21.0 (3b72af97e 2017-10-09)
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./compute b2sum:
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0860d8c9b48596c811111f20198d6ea6212889ae935dfef1f0f818b81c393e75ac6acb13fc7d061310b99b4f2cf9b25820f8d0150a8a21313c070aa45e8c511f
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Then I copied the binary to a fresh USB just bought and I re-formatted it
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Side-channel defences
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====================
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For the computation I used a very old Sony Vaio vpceb1j8e unplugging the hard drive and booting the computer from a second fresh Lubuntu livecd usb stick (re-formatted)
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(lubuntu-17.10-desktop-amd64.iso)
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md5 48703ddd81aab8dce53264cb8a8c5202
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Then I copied the compute binaries and the challenge with the first USB key into RAM and start the compute process
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I have performed the full activity in person with noone in the same room
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Postprocessing
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==============
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After ./compute was finished, I took a picture with cell of the blake2 hash of the response. Then copied back the response file to the first USB stick containing the binaries, and then shut down the Vaio in which the computation occurred.
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All the communication inbound and outbound has occurred through a different computer and the 2 USB keys mentioned
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I will not destroy the Vaio (I think it will not survive much longer after the last 5 hours) therefore I'm going to leave it unplugged for the next month
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