From 13d0f55865f8b1b851ce1e84597b144c5fd41662 Mon Sep 17 00:00:00 2001
From: Rob Austein <sra@hactrn.net>
Date: Sun, 13 Sep 2020 23:15:43 +0000
Subject: GC

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-{{{
-#!htmlcomment
-
-This page is maintained automatically by a script.  Don't modify this page by hand,
-your changes will just be overwritten the next time the script runs.  Talk to your
-Friendly Neighborhood Repository Maintainer if you need to change something here.
-
-}}}
-
-{{{
-#!html
-<h1>Cryptech tamper detection</h1>
-
-<p>This is software for the Atmel AVR ATtiny828 MCU on the Cryptech alpha
-board, rev02, implementing tamper detection and master key erasure.</p>
-
-<h2>Overview</h2>
-
-<pre><code>   *************
-   * P A N I C *
-   *   button  *
-   *************
-    /
-   /
-  /
-AVR ---- SPI mux ---- FPGA
-            |          |
-            |         ARM
-           MKM
-
-AVR -- Atmel MCU
-FPGA -- FPGA
-MKM -- Master Key Memory, 23K640 SRAM
-SPI mux -- 2 x MC74AC244DW
-ARM -- ARM CPU
-</code></pre>
-
-<p>The MKM holds the master key for the device.</p>
-
-<p>The AVR, MKM and the mux are all battery powered.</p>
-
-<p>The AVR and the FPGA are both sharing access to the MKM through the
-mux, with the AVR connected to the pins used for deciding who's in
-control of the memory. If the AVR doesn't actively grab control of the
-MKM, the FPGA is in control.</p>
-
-<p>When the panic button is pressed, the AVR takes control over the MKM
-and writes zeros to it as quickly as possible. In idle mode, i.e. when
-the panic button is not pressed, the AVR tries to consume as little
-power as possible.</p>
-
-<h2>Building the software</h2>
-
-<p>To build a .hex file suitible for uploading to a board with a
-ATTiny828, a C compiler for AVR is needed, as wells a objcopy. On a
-Debian system, the following command can be used for installing both:</p>
-
-<pre><code>apt-get install gcc-avr binutils-avr avr-libc
-</code></pre>
-
-<p>To build tamper.hex, type 'make' in this directory.</p>
-
-<p>To upload a .hex file to a board, the program avrdude can be used. On
-a Debian system, the following command can be used for installing
-avrdude:</p>
-
-<pre><code>apt-get install avrdude
-</code></pre>
-
-<p>If configuration for ATtiny828 is missing, the file attiny828.conf in
-this directory could be appended to avrdude.conf:</p>
-
-<pre><code>cat attiny828.conf &gt;&gt; /etc/avrdude.conf
-</code></pre>
-
-<p>Often, a piece of hardware called "SPI programmer" is needed in order
-to upload the .hex file to the target system. The one I've been using
-has "sparkfun.com" printed on it. This small board has a mini-USB port
-to connect to a host system and a header with SPI pins to connect to a
-board with an AVR on it.</p>
-
-<p>To upload a .hex file to a board, use the upload.sh shell script in
-this directory with the name of the file as the only argument:</p>
-
-<pre><code>./upload.sh tamper.hex
-</code></pre>
-
-<p>Depending on permissions on your host system you might want to run the
-upload script as root.</p>
-}}}
-
-[[RepositoryIndex(format=table,glob=user/ft/tamper)]]
-
-|| Clone `https://git.cryptech.is/user/ft/tamper.git` ||
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