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# BLAKE-256 (or BLAKE32) Hash function: BS and MS Project- IISERB(2022-23)

# Implementation of BLAKE Hash Function in C
### ECS412(BS Project) - April 2022
Under the BS project, the working principles and methods the BLAKE-256 hash functions was studied and implemented to produce hash for a given string or any binary file. Later, under the MS project, properties of BLAKE-256 were analysed and preimage attacks were mounted on the round-reduced(i.e. 1.5 and 2 rounds) versions. This repository contains both the works combined and uses C/C++ programming language for implementations of the functions and attacks.
## Author

This project studies the working principles and methods of the [MD5](https://github.com/ajaycc17/md5-hash-function) and BLAKE hash functions. MD5 hash
function is not cryptographically secure now, it has already been broken and is used only for local integrity
checks and other simple tasks, but it is a great example to understand the concept of hash functions; it
introduces message compression using a naive method and then with the help of some non-linear functions
on the message, the hash for the message is generated. The BLAKE hash function is similar to the MD5 hash
function for a few initial steps. MD5 produces a 128-bit hash value with the compression of the message by
adding some extra bits and applying some non-linear functions. But in BLAKE, a core function uses 16
different states to process the content of the message and generates a 256-bit hash value. The working
method of both the hash functions is explained, and the hash functions are implemented in the C
programming language for simple string values.
- [@ajaycc17](https://www.github.com/ajaycc17)

## Under guidance of

## Author
- Dr Shashank Singh([IISER Bhopal](https://sites.google.com/view/shashank))

- [@ajaycc17](https://www.github.com/ajaycc17)(Ajay Choudhury)

## Acknowledgements

- Jean-Philippe Aumasson, Luca Henzen, Willi Meier, Raphael C.-W. Phan: [Sha-3 proposal blake. Submission to NIST (2008)](https://www.aumasson.jp/blake/blake.pdf)
- Ji, L., Liangyu, X.: Attacks on round-reduced BLAKE. [Cryptology ePrint Archive, Report 2009/238 (2009)](https://eprint.iacr.org/2009/238.pdf)
- Jean-Philippe Aumasson, Jian Guo, Simon Knellwolf, Krystian Matusiewicz, and Willi Meier: [Differential and invertibility properties of BLAKE (full version). [Cryptology ePrint Archive, Report 2010/043 (2010)](https://eprint.iacr.org/2010/043.pdf)

## Under Guidance of:
Dr. Shashank Singh [(IISER Bhopal)](https://sites.google.com/view/shashank).

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