50 lines
3.3 KiB
Markdown
50 lines
3.3 KiB
Markdown
# STRIX
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### Satellite True Random Information eXtractor
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[](https://docs.arduino.cc/hardware/mkr-vidor-4000/)
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[](https://github.com/jetify-com/devbox/)
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[](LICENSE)
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[](https://ai-declaration.md)
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A portable wireless True Random Number Generator built on an Arduino MKR Vidor 4000.
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## Design
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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 USB, over HTTP on its own WiFi access point (stationary mode, on a charger), or over Bluetooth LE (mobile mode, on battery).
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- 4 independent generators × 90 ring oscillators. Each generator XORs its rings every 120 MHz clock (spatial) and then several consecutive bits (temporal, default 5): about 24 Mbps per generator.
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- Separate stream per generator, plus a combined stream of all healthy generators
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- On-device health tests per generator: NIST SP 800-90B repetition count and adaptive proportion, plus a dead-ring monitor
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- Live statistics per trial: bias, z-score, random walk and lag-1 autocorrelation, with rolling and cumulative windows
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- Configurable random-walk / majority-vote bias amplifier on a bias path and an autocorrelation path, with sub-trial voting
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- Von Neumann extractor that can be toggled on the stream, statistics and amplifier paths
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- Per-second trials in Global Consciousness Project format (200-bit XOR-masked sums per generator, plus full-rate sums), with Stouffer Z and network variance
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- Raw ring captures and frequency measurement for characterization
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The USB, HTTP and BLE API is documented in [arduino/strix/API.md](arduino/strix/API.md).
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## Command-line client
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`tools/strix.py` talks to the device over USB; run it with `devbox run strix <command>` or `uv run tools/strix.py <command>`. It finds the board by its USB ID (override with `--port` or `STRIX_PORT`).
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| Command | Does |
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|---|---|
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| `id`, `health`, `amp`, `get` | Prints the device's reply |
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| `stats [--reset]` | Prints the statistics, or restarts them |
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| `set KEY VALUE` | Changes a setting (keys in the API documentation) |
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| `entropy N [--out FILE]` | N entropy bytes as hex, or binary into a file |
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| `watch stats\|amp` | Prints every new trial until Ctrl-C |
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| `gcp [--log FILE] [--full] [--seconds N]` | Follows the per-second GCP-format trials |
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| `send LINE` | Sends any command line and prints the reply |
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`gcp` prints one line per second: UTC time, second number, the four 200-bit sums, Stouffer Z, Z², and the cumulative Z² − 1 with its p = 0.05 envelope (`*` when outside). `--full` tracks the full-rate trials instead. It reconnects after USB dropouts and fills missed seconds from the device's 60-second history. `--log` appends GCP-style CSV rows, `13,<unix time>,<UTC date-time>,<g0>,<g1>,<g2>,<g3>` (empty for unhealthy generators), after a `12,gmtime,Date/Time,g0,g1,g2,g3` header.
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## TODO
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- WiFi credentials stored on the device instead of compile-time defaults
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- Battery pack
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- 3D case
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---
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## [Development Notes](NOTES.md)
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