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{{Warningbox|This tutorial has been updated for ChipWhisperer 4.0.0 release. If you are using 3.x.x see the "V3" link in the sidebar.}} {{Infobox tutorial|name = Tutorial #B5: Breaking AES (Straightforward) |image =|caption = |software versions =|capture hardware = CW-Lite, CW-Lite 2-Part, CW-Pro|Target Device = |Target Architecture = XMEGA/ARM|Hardware Crypto = No|Purchase Hardware = }}
This tutorial will take you through a complete attack on a software AES implementation. The specific implementation being attacked is a well-known AES implementation written in C, which is likely to be similar to other implementations used by proprietary systems.
== Capturing ==
This tutorial runs on four different hardware targets. You only need to follow the steps for your given hardware.
=== Capturing with ChipWhisperer-Lite /Pro with default XMEGA Target (CW1173 + CW303) === WARNING: This video was recorded with API V3.x, some changes happened so please take note.
NOTE: You can see a Quick-Start Guide and Video for this target on the [[CW1173_ChipWhisperer-Lite]] page:
=== Hardware Setup ===
{{CollapsibleSection|intro === Capturing the Traces ==CW1200 (Pro) Hardware Setup ====|content= CW1200 HW Setup}}
== Capturing with ChipWhisperer= Building Firmware ===Note that for this tutorial, you'll need to use the <code>simpleserial-Lite aes</code> firmware.{{CollapsibleSection|intro = ==== Building for CWLite with NOTDuino (CW1173 + CW304) XMEGA Target ====|content=Building for XMEGA}}
{{CollapsibleSection|intro === Hardware Setup ==Building for CWLite with Arm Target ====|content= Building for Arm}}
=== Capturing Flashing Firmware ===Note that for this tutorial, you'll need to use the Traces <code>simpleserial-aes</code> firmware. We won't be modifying the firmware, so feel free to just build in the <code>simpleserial-aes</code> folder.{{CollapsibleSection|intro = ==== Programming the XMEGA Target ====|content=Programming XMEGA}}
{{CollapsibleSection|intro == Capturing with Capture Rev2 + Multi-Target (CW1002 + CW301) === Programming Other Targets ====|content= Programming Other}}
=== Hardware Setup Capturing the Traces ===
The Multi-Target board window should be plugged into the ChipWhisperer Capture Rev2 via the 20-pin target cable. The ''VOUT'' SMA connector is wired change to indicate the ''LNA'' input on the ChipWhisperer-Capture Rev2 front panel. The general hardware setup is as followsconnect succeeded:
<li>Switch to the ''General Settings'' tab</li>
<li>If you wish to change the number of traces, do so here. The default of 50 should be sufficient to break AES for most targets though!</li>
<li>Hit the ''Capture Many'' button (M in a green triangle) to start the capture process.</li>
<li>You will see each new trace plotted in the waveform display.</li>
<li>You'll see the trace count in the status bar. Once it says ''Trace 50 done'' (assuming you requested 50 traces) the capture process is complete.</li></ol></blockquote></li>
<li>Finally save this project using the ''File --> Save Project'' option, give it any name you want.</li>
<li>Skip ahead to [[#Analyzing_the_Traces]].</li></ol>
== Capturing with PicoScope + Multi-Target (CW301) Analyzing the Traces ==
<ol style="list-style-type: decimal;">
<li>Open the Analyzer software</li>
<li>From the ''File --> Open Project'' option, navigate to the .cwp file you save previously. Open this file.</li>
<li><p>Select Switch to the ''Project --> Manage TracesTrace Output Plot'' option to open tab on the dialog, enable the captured traces by adding a check-mark in the boxright side. Close </li><li>Switch to the dialog with `ESC`:''Results'' setting tab on the left side</pli><li>Scroll down to the ''Trace Output Plot'' setting, highlighted below:<p>[[File:tracemanagev4_tracedraw.png|image500px]]</p></li><li>You can choose to plot a specific range of traces. For example type '''0-10''' in the ''Trace(s) to plot'' window.<p/li>If <li>Hit the ''Redraw'' button when you wish change the trace plot range.</li><li>You can right-click on the waveform to view change options, or left-click and drag to zoom.</li><li>Use the toolbar to quickly reset the zoom back to original.</li><li>Try more advanced plotting options, like '''0(r),4-7(b)''' to plot trace data0 in red, follow these steps:and 4-6 in blue. See a full list of possible commands on the page [[Plotting_Widget]].</pli></ol>
The default options should work, but you can modify for example the ''Reporting Interval'' to see more detailed graphs. <p>[[Fileol style="list-style-type:attacksettings.png|image]]</p></lidecimal;"><li><p>Finally run the attack by switching to the ''Results Table'' tab and then hitting the ''AttackRun'' buttonwith the script selected:</p><p>[[File:attackv4_runscript.png|image400px]]</p></li>
<li><p>If you adjusted the ''Reporting Interval'' to a smaller number such as 5, you'll see the progression of attack results as more traces are used. If not you should simply see the final results, which should have the correct key highlighted in red. In the following case the correct key ''was'' recovered:</p>
<p>[[File:attack-done.png|image]]</p></li>
== Next Steps ==
This has only briefly outlined how to perform a CPA attack. You can move onto more advanced tutorials, especially showing you how the actual attack works when performed manually.This tutorial also utilized tiny-AES128-C for Arm targets, which uses the same operations as the XMEGA target. For a more typical 32 bit AES attack, see [[Tutorial A8 32bit AES]]. == Links == {{Template:Tutorials}}[[Category:Tutorials]]
