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The world needs more entropy!

The ChaosKey is a fully libre & open design, hardware random number generator for use with computers that have an available USB port.

The design provides bits at the maximum rate supported by full-speed USB, which is approximately 1 megabyte per second.

For Linux systems running kernel version 4.1 or newer, operation is as simple as plugging in the device, as a suitable driver for feeding random bits into the kernel entropy pool is already present in the kernel, and ChaosKey will automatically be detected and bound to this driver.

Source code & hardware design

In this video the creators talk about the ChaosKeys (warning, youtube): https://youtu.be/SkR3-FOpX0A

Source code for the firmware, flash loader and a utility to pull raw bits from the noise source are available here:
AltOS Git Repository

Hardware designs using gEDA are available here:
ChaosKey Hardware Design Files

Firmware Features

AltOS is written mostly in C with some ARM assembler

Tools Used

• gEDA for schematic capture and PCB layout
• GCC compiler and source debugger

Licenses

• The hardware is licensed under the TAPR Open Hardware License
• The software is licensed GPL version 2