3 This is a hardware True Random Number Generator that attaches via USB.
5 The Linux Kernel, starting with version 4.1, includes source for this
6 driver. It should be built by default in your distribution. If your
7 using Linux + KVM to host other Linux instances, read the
8 [VirtualMachine](VirtualMachine.html) page to see how you can configure the guests to share
9 the host entropy source.
13 1.0 is the first production version of ChaosKey, now available for sale
14 in single units and packs of 10 and 25 units at
15 [Garbee and Garbee](http://shop.gag.com/random.html).
17 <a href="v1.0/chaoskey-bare.jpg"><img src="v1.0/chaoskey-bare-thumb.jpg"></a>
19 <a href="v1.0/chaoskey-boxed.jpg"><img src="v1.0/chaoskey-boxed-thumb.jpg"></a>
21 ### Version 1.0 Hardware ###
23 * [STM32F042](http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1574/LN1823?icmp=stm32f0x2-line_pron_pr_jan2014&sc=stm32f0x2-pr) System-on-Chip
28 * Crystal-less operation
30 * AP3015A boost regulator
31 * back-to-back 3904 transistor noise
32 * [OPA356](http://www.ti.com/product/opa356) op amp
35 Here's a circuit diagram of the noise source:
37 <img src="v1.0/noise-source.svg">
39 ### Version 1.0 Bits ###
41 Source code for the firmware, flash loader and a utility to pull raw
42 bits from the noise source are available here:
44 [AltOS Git Repository](http://git.gag.com/?p=fw/altos;a=summary)
46 [ChaosKey Firmware version 1.6.7](v1.0/chaoskey-v1.0-1.6.7.elf)
48 [ChaosKey Boot Loader version 1.6.7](v1.0/chaoskey-v1.0-altos-flash-1.6.7.elf)
50 Hardware designs using [gEDA](http://www.geda-project.org/) are
53 [ChaosKey Hardware Design Files](http://git.gag.com/?p=hw/chaoskey;a=summary)
58 This one uses the better noise source coupled with an op amp that
59 provides 2MHz of bandwidth at a gain of 100, offering linear frequency
60 response at a million samples per second.
62 A photo of prototype version 0.3:
64 <a href="v0.3/chaoskey-v0.3.jpg"> <img src="v0.3/chaoskey-v0.3-thumb.jpg"></a>
66 Here's a circuit diagram of the noise source:
68 <img src="v0.3/noise-source.svg">
70 Version 0.3 uses the same hardware design as version 1.0, except that
71 it uses a QFP package version of the processor instead of the QFN used
72 in 1.0, and hence needs a larger circuit board.
76 This version uses a better noise source, but the single transistor amp
77 designed to get from the 20mV noise source to a digital value doesn't
78 provide enough bandwidth, so the resulting signal seen by the CPU has
79 poor frequency response.
81 Here's a photo of prototype version 0.2:
83 <a href="v0.2/chaoskey-v0.2.jpg"> <img src="v0.2/chaoskey-v0.2-thumb.jpg"></a>
85 ### Version 0.2 Hardware ###
87 * [STM32F042](http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1574/LN1823?icmp=stm32f0x2-line_pron_pr_jan2014&sc=stm32f0x2-pr) System-on-Chip
92 * Crystal-less operation
94 * AP3015A boost regulator
95 * back-to-back 3904 transistor noise
99 These are photos of prototype version 0.1:
101 <a href="v0.1/chaoskey-v0.1-top.jpg"> <img src="v0.1/chaoskey-v0.1-top-thumb.jpg"></a>
102 <a href="v0.1/chaoskey-v0.1-bottom.jpg"> <img src="v0.1/chaoskey-v0.1-bottom-thumb.jpg"></a>
104 ### Version 0.1 Hardware ###
106 * [NXP LPC11U14](http://www.nxp.com/products/microcontrollers/cortex_m0_m0/LPC11U14FHI33.html) System-on-Chip
111 * 8 12-bit analog inputs
112 * I2C, SPI, async serial
114 * ZXRE1004 zener diode noise source
115 * MCP6L92 dual op-amp
120 * [AltOS](../AltOS/) is written mostly in C with some ARM assembler
122 * [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
123 * [GCC](http://gcc.gnu.org/) compiler and source debugger
125 * The hardware is licensed under the [TAPR](http://www.tapr.org) [Open Hardware License](http://www.tapr.org/ohl.html)
126 * The software is licensed [GPL version 2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)