# STRIX
### Satellite True Random Information eXtractor

A portable wireless True Random Number Generator built on an Arduino MKR Vidor 4000.

## Planned Design

Entropy comes from FPGA ring oscillators whose sampled timing jitter is XOR-combined into output bits, with no pseudo-random post-processing. A SAMD21 serves the results over WiFi and USB.

- Separate stream per entropy source
- Raw and processed output modes, with a von Neumann extractor that can be toggled per output path
- On-device health tests (NIST SP 800-90B repetition count and adaptive proportion)
- Live statistics: bias, z-score, random walk and autocorrelation
- Configurable random-walk / majority-vote bias amplifier

## Set Up Dev Environment

Windows:

1. Install Arduino IDE from here or via chocolatey: `choco install arduino`
2. Install [Intel Quartus Lite](https://www.intel.com/content/www/us/en/software-kit/825278/intel-quartus-prime-lite-edition-design-software-version-23-1-1-for-windows.html). In the list of devices select `Cyclone 10 LP device support`

## FPGA Development

- Intel Quartus
    - Open Project > select `strix.qpf` from the `fpga/src` directory in this repo.

## MCU Development

- Arduino IDE
    - Boards Manager > Install 'Arduino SAMD Boards' (search for 'Vidor 4000')
    - Library Manager > Install
        - VidorPeripherals
        - WiFiNINA (1.8.5, not higher)
    - Open Project > `strix.ino` from the `arduino/strix` directory in this repo


## TODO

- Implement ring-oscillator entropy generators on the MKR Vidor 4000 FPGA
- Fetch random numbers from the FPGA via SPI
- Serve random numbers via USB
- Make Vidor pairable via Bluetooth/Wifi
- serve randomness wirelessly
- battery pack
- 3D case

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## [Development Notes](NOTES.md)