https://github.com/lcian/klein-cryptanalysis

🔓 Differential cryptanalysis attack on the KLEIN block cipher | Chosen Plaintext Attack | Key Recovery
https://github.com/lcian/klein-cryptanalysis

cryptanalysis cryptography

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🔓 Differential cryptanalysis attack on the KLEIN block cipher | Chosen Plaintext Attack | Key Recovery

• Host: GitHub
• URL: https://github.com/lcian/klein-cryptanalysis
• Owner: lcian
• Created: 2023-05-14T11:51:34.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2024-05-13T08:47:53.000Z (6 months ago)
• Last Synced: 2024-05-13T09:54:36.683Z (6 months ago)
• Topics: cryptanalysis, cryptography
• Language: C
• Homepage:
• Size: 847 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        

# Differential cryptanalysis of KLEIN

This is an implementation of a differential attack on a round-reduced version of the [KLEIN](https://link.springer.com/chapter/10.1007/978-3-642-25286-0_1) block cipher, achieving key recovery.

The attack is implemented purely in C, with the option to use OpenMP to parallelize the brute-force phase.

![](./media/demo.gif)

On an AMD Ryzen 7 4700U (8 cores), the attack takes around 5 seconds for 5 rounds and around 3 minutes for 6 rounds.

A full report is available [here](report.pdf).

The differential is based on [this paper](https://eprint.iacr.org/2014/090).

The original KLEIN implementation by Gong Zheng is used, which is also available at [this repository](https://github.com/GongZheng/KLEIN).

# Usage

```sh

git clone https://github.com/lcian/klein-cryptanalysis.git

cd klein-cryptanalysis/src

$EDITOR config.h # set the master key and the number of rounds

make

./attack

```