+[[!meta title="ChaosKey"]]
# ChaosKey
This is a hardware True Random Number Generator that attaches via USB.
-## Version 0.3 ##
+The Linux Kernel, starting with version 4.1, includes source for this
+driver. It should be built by default in your distribution. If your
+using Linux + KVM to host other Linux instances, read the
+[VirtualMachine](VirtualMachine.html) page to see how you can configure the guests to share
+the host entropy source.
-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.
+## Version 1.0 ##
-A photo of prototype version 0.3:
+ChaosKey is now out of production, but some units may still be available through our
+European distributor
+[vikings](https://store.vikings.net/chaoskey).
-<a href="v0.3/chaoskey-v0.3.jpg"> <img src="v0.3/chaoskey-v0.3-thumb.jpg"></a>
+<a href="v1.0/chaoskey-bare.jpg"><img src="v1.0/chaoskey-bare-thumb.jpg"></a>
-Here's a circuit diagram of the noise source:
+<a href="v1.0/chaoskey-boxed.jpg"><img src="v1.0/chaoskey-boxed-thumb.jpg"></a>
-<img src="v.03/noise-source.svg">
+### Reflashing Firmware ###
-### Version 0.2 Hardware ###
+To reflash the system firmware on ChaosKey, you first need to get the
+device into 'bootloader mode'. To do this, you must power-up ChaosKey
+with a jumper between GND and the Boot Loader Select pin.
+
+Open up ChaosKey by prying the case apart. There's no glue or screws,
+so a thin tool or fingernail should suffice to split the case into two
+pieces. Once you've opened it up, you'll find the inside that looks
+much like this:
+
+<img src="chaoskey-connector.svg">
+
+Connect a wire between the two red holes in the debug connector and
+then plug it in to your computer. It will appear as a USB modem device
+called AltosFlash with USB ID fffe:000a.
+
+Use the 'ao-usbload' program, which is part of the
+[AltOS repository](https://altusmetrum.org/AltOS/)
+and is packaged for Debian in the 'altos' package:
+
+ $ ao-usbload chaoskey-v1.0-*.elf
+
+### 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
* [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)
+
+[ChaosKey Firmware version 1.6.7](v1.0/chaoskey-v1.0-1.6.7.elf)
+
+[ChaosKey Boot Loader version 1.6.7](v1.0/chaoskey-v1.0-altos-flash-1.6.7.elf)
+
+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
* 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)
-
-## Artifacts ##
-
-The hardware design files can be found on [git.gag.com](http://git.gag.com)
-in the project [hw/usbtrng](http://git.gag.com/?p=hw/usbtrng;a=summary).
-
projects / web / altusmetrum / blobdiff