Tutorial CW305-3 Clock Glitching

The goal of this tutorial is to apply clock glitching to the CW305 Artix target, causing it to produce erroneous results during the encryption process. This isn't the most interesting software to glitch - in Tutorial A2 Introduction to Glitch Attacks (including Glitch Explorer), we glitched past a password check, which is a much more rewarding target. However, the setup and process in this tutorial is applicable to a wide range of FPGA programs.

Background

- One round per clock cycle - Should be possible to apply glitches near the clock edges - Causes a "fake" execution, overwriting the state data

Glitch Setup

Hardware Setup

- Tutorial Cw305-1 - Run script - Clock switches - ChipWhisperer clock output (glitch module)

Glitch Explorer

- Fixed plaintext and key - Look for exact output match for "normal" output - Everything else is success - Ranges for glitch width/offset

Results

- Glitch explorer plot - Examples of erroneous output - Repeatability

Further Analysis

- AES intermediate script - Outline code process - Show code in appendix - Show output plots

Tutorials

See Tutorial Map for important information & suggested order of completion.

Theory

Correlation Power Analysis

Template Attacks

Extending AES-128 Attacks to AES-256

Basic Tutorials

Tutorial B1 Building a SimpleSerial Project

Tutorial B2 Viewing Instruction Power Differences

Tutorial B3-1 Timing Analysis with Power for Password Bypass

Tutorial B5 Breaking AES (Straightforward)

Tutorial B6 Breaking AES (Manual CPA Attack)

Tutorial B7 Profiling Attacks (with HW Assumption)

Tutorial B11 Breaking RSA

Advanced Tutorials

Tutorial A2 Introduction to Glitch Attacks (including Glitch Explorer)

Tutorial A3 VCC Glitch Attacks

Tutorial A5 Breaking AES-256 Bootloader

Tutorial A5-Bonus Breaking AES-256 Bootloader

Tutorial A7 Glitch Buffer Attacks

Tutorial A8 32bit AES

Hardware-Specific Tutorials

Tutorial P1 Stream Mode and Advanced Triggering (CW Pro)

Tutorial CW305-1 Building a Project

Tutorial CW305-2 Breaking AES on FPGA

Tutorial CW305-3 Clock Glitching

Tutorial CW305-4 Voltage Glitching with Crowbars

Archived Tutorials (v4/v3 only)

Tutorial B3-2 Timing Analysis with Power for Attacking TSB

Tutorial B4 Testing Two Partitions of Traces

Tutorial B5-2 Breaking DES (Straightforward)

Tutorial B8 Profiling Attacks (Manual Template Attack)

Tutorial B9 The Preprocessing Modules

Tutorial B10 Using with SASEBO-W CardOS or DPA Contest v4.2

Tutorial A1 Synchronization to Communication Lines

Tutorial A4 SAD Trigger for SCA and Glitch

Tutorial A6 Replication of Ilya Kizhvatov's XMEGA® Attack

Tutorial A9 Bypassing LPC1114 Read Protect