This repository contains the implementation of the local-collision differential 22-rounds attack (deterministic) & 24-rounds attack (probabilistic) on SHA-256 in C which are described in "New Collision Attacks against Up to 24-Step SHA-2".

1. Clone the repository: git clone "https://github.com/ChakshuGupta13/Local-Collision-Differential-Attack-on-Reduced-SHA-256-upto-24-Rounds.git"
2. Traverse to the cloned directory and then build directory: cd ./Local-Collision-Differential-Attack-on-Reduced-SHA-256-upto-24-Rounds/build
3. Build CMake project: cmake .
4. Build executable files: make

1. To mount 22-round attack, run: ./22-attack inside the build directory.
2. To mount 24-round attack, run: ./24-attack inside the build directory.

Note: As the 24-round attack is probabilistic in nature, therefore, the running time for the program is approximately 5-10 minutes.