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Tutorial B8 Profiling Attacks (Manual Template Attack)

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This tutorial is a more hands-on version of the previous tutorial. Rather than getting the ChipWhisperer Analyzer software to generate the points of interest and the template distributions, this tutorial will work directly with the recorded trace data in Python.

It is highly recommended that you read the theory page on Template Attacks before attempting this tutorial. There is some relatively complex processing involved, and it may be helpful to get a mathematical view on the steps before attempting to program them.

Additionally, this tutorial uses some terminology from previous tutorials, such as Hamming weight and substitution box. If you don't know what these are, Tutorial B6 Breaking AES (Manual CPA Attack) might be an easier starting point.

Capturing the Traces

Use data from previous tutorial (fixed/random key)

Creating the Template

Steps to make the template

Mention Hamming weight assumption

Loading the Traces

Sorting the Traces

Points of Interest

Covariance Matrices

Performing the Attack

Steps to crack the code (tm)

Loading the Traces

Using the Template

Gotchas

  • Too little data (0 or 1 trace)
  • Flukes + statistics