# ChaosKey

This is a hardware True Random Number Generator that attaches via USB.

## Version 1.0 ##

1.0 is the first production version of ChaosKey. The first run of 1000
units is expected sometime around August, 2016.

<a href="v1.0/chaoskey-bare.jpg"><img src="v1.0/chaoskey-bare-thumb.jpg"></a>

<a href="v1.0/chaoskey-boxed.jpg"><img src="v1.0/chaoskey-boxed-thumb.jpg"></a>

### Version 1.0 Hardware ###

 * [STM32F042](http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1574/LN1823?icmp=stm32f0x2-line_pron_pr_jan2014&sc=stm32f0x2-pr) System-on-Chip
    * ARM Cortex-M0 MCU
    * 32k Flash
    * 6k RAM
    * USB 2.0 Full Speed
    * Crystal-less operation
 * 20V noise source
    * AP3015A boost regulator
    * back-to-back 3904 transistor noise
 * [OPA356](http://www.ti.com/product/opa356) op amp
    * 200MHz GBP

Here's a circuit diagram of the noise source:

<img src="v1.0/noise-source.svg">

### Version 1.0 Bits ###

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

[AltOS Git Repository](http://git.gag.com/?p=fw/altos;a=summary)

Hardware designs using [gEDA](http://www.geda-project.org/) are
available here:

[ChaosKey Hardware Design Files](http://git.gag.com/?p=hw/chaoskey;a=summary)

## Version 0.3 ##

This one uses the better noise source coupled with an op amp that
provides 2MHz of bandwidth at a gain of 100, offering linear frequency
response at a million samples per second.

A photo of prototype version 0.3:

<a href="v0.3/chaoskey-v0.3.jpg"> <img src="v0.3/chaoskey-v0.3-thumb.jpg"></a>

Here's a circuit diagram of the noise source:

<img src="v0.3/noise-source.svg">

Version 0.3 uses the same hardware design as version 1.0, except that
it uses a QFP package version of the processor instead of the QFN used
in 1.0, and hence needs a larger circuit board.

## Version 0.2 ##

This version uses a better noise source, but the single transistor amp
designed to get from the 20mV noise source to a digital value doesn't
provide enough bandwidth, so the resulting signal seen by the CPU has
poor frequency response.

Here's a photo of prototype version 0.2:

<a href="v0.2/chaoskey-v0.2.jpg"> <img src="v0.2/chaoskey-v0.2-thumb.jpg"></a>

### Version 0.2 Hardware ###

 * [STM32F042](http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1574/LN1823?icmp=stm32f0x2-line_pron_pr_jan2014&sc=stm32f0x2-pr) System-on-Chip
    * ARM Cortex-M0 MCU
    * 32k Flash
    * 6k RAM
    * USB 2.0
    * Crystal-less operation
 * 20V noise source
    * AP3015A boost regulator
    * back-to-back 3904 transistor noise

## Version 0.1 ##

These are photos of prototype version 0.1:

<a href="v0.1/chaoskey-v0.1-top.jpg"> <img src="v0.1/chaoskey-v0.1-top-thumb.jpg"></a>
<a href="v0.1/chaoskey-v0.1-bottom.jpg"> <img src="v0.1/chaoskey-v0.1-bottom-thumb.jpg"></a>

### Version 0.1 Hardware ###

 * [NXP LPC11U14](http://www.nxp.com/products/microcontrollers/cortex_m0_m0/LPC11U14FHI33.html) System-on-Chip
	* ARM Cortex-M0 MCU
	* 32k Flash
	* 6k RAM
	* USB 2.0
	* 8 12-bit analog inputs
	* I2C, SPI, async serial
	* digital I/O
 * ZXRE1004 zener diode noise source
 * MCP6L92 dual op-amp

## Software ##

* Firmware Features
	* [AltOS](../AltOS/) is written mostly in C with some ARM assembler
* Tools Used
	* [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
	* [GCC](http://gcc.gnu.org/) compiler and source debugger
* Licenses
	* The hardware is licensed under the [TAPR](http://www.tapr.org) [Open Hardware License](http://www.tapr.org/ohl.html)
	* The software is licensed [GPL version 2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)