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author | Rob Austein <sra@hactrn.net> | 2020-09-13 23:06:24 +0000 |
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committer | Rob Austein <sra@hactrn.net> | 2020-09-13 23:06:24 +0000 |
commit | 891730d13b324fad916572a82f0bd610c5de9aad (patch) | |
tree | f46c94ddfff34f15aafe7cac0596716d1c13c412 /raw-wiki-dump/GitRepositories%2Fuser%2Fln5%2Ftamper | |
parent | b092ffbcbe2c9398494f7dc9db6f0796971633e0 (diff) |
Rename for conversion
Diffstat (limited to 'raw-wiki-dump/GitRepositories%2Fuser%2Fln5%2Ftamper')
-rw-r--r-- | raw-wiki-dump/GitRepositories%2Fuser%2Fln5%2Ftamper | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/raw-wiki-dump/GitRepositories%2Fuser%2Fln5%2Ftamper b/raw-wiki-dump/GitRepositories%2Fuser%2Fln5%2Ftamper deleted file mode 100644 index 1e885b1..0000000 --- a/raw-wiki-dump/GitRepositories%2Fuser%2Fln5%2Ftamper +++ /dev/null @@ -1,94 +0,0 @@ -{{{ -#!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 >> /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/ln5/tamper)]] - -|| Clone `https://git.cryptech.is/user/ln5/tamper.git` || |