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Calculating the 24th word with a Raspberry Pi - step by step guide #84

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Calculating the 24th word with a Raspberry Pi - step by step guide #84

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Update paper-advanced.md
fatrattombala Jan 28, 2021
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39 changes: 39 additions & 0 deletions _pages/setup-wallets/paper-advanced.md
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Expand Up @@ -38,6 +38,45 @@ You can further enhance this with two (optional) steps:
Note that these do not work perfectly on Flash memory (SSD drives), so the previous technique is preferred.
You can read more about this [here](https://wiki.archlinux.org/index.php/Securely_wipe_disk) and [here](https://www.howtogeek.com/234683/why-you-cant-securely-delete-a-file-and-what-to-do-instead/).

##### Using a Raspberry Pi without internet connection and the "human-rng-golang"-tool
- prepare two SD-cards (minimum 8 GByte) with Raspberry Pi OS (https://www.raspberrypi.org/software/)
- boot from one, connect to the internet
- install the Go language from https://golang.org/dl/ for the ARM architecture:
- download the latest version for 32-Bit-ARM architecture (**not 64-Bit!**)
- i.e. go1.15.7.linux-armv6l.tar.gz
- don't install it with `$ sudo apt install golang`; this version is too old
- follow the installation instructions: https://golang.org/doc/install
- build the human-rng-golang-tool from source with the terminal as described here: https://github.com/mflaxman/human-rng-golang
- building the tool on Intel architecture for the Raspi OS does **not** work!
- copy the resulting "main" file to an USB stick
- visit https://seedpicker.net/ and save the entire website to the USB stick
- shutdown the Raspberry Pi
- disconnect any prevailing physical ethernet-cable

then restart the Raspberry Pi with **the other** prepared Raspberry Pi OS system
- don't connect to WiFi!
- disable network-adapters:
- add two lines to the file /boot/config.txt (terminal: sudo nano /boot/config.txt):
- `dtoverlay=disable-wifi`
- `dtoverlay=disable-bt`
- reboot
- load the seedpicker website from your USB stick
- do the dry-run with 23 x "zoo"
- copy "main" from the USB stick to the user pi's home directory
- make it executable: `$ sudo chmod +x main`
- do the dry-run with the tool as described here: https://github.com/mflaxman/human-rng-golang
- go "live": hack in your seed and calculate the 24th checksum word with
1. the loaded seedpicker page in the browser, and
1. with the human-rng-golang tool (the "main" executable)
- compare the 24th word and the zpub
- write down the 24th word on your backup piece of paper
- don't forget to export the .json-file for Specter Desktop to your USB stick
- delete browsing data in the browser's preferences
- delete the hidden file .bash-history in the user pi's home directory
- shutdown the Pi
- use a tool like "shred" (command line) to fully erase the micro SD card - or destroy it physically


## Verify Seed Generation

#### Confirm Seed Matches Zpub
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