Playfair Cipher Encryption/Decryption Application

This project implements the Playfair cipher in two interchangeable dynamic libraries: a high-level C/C++/C# reference implementation and an optimized x86/x64 Assembly version using SIMD (SSE4.1/AVX2). A Windows GUI allows users to input text and keys, switch between DLLs at runtime, run encryption or decryption, and benchmark performance across implementations.

Currently implemented

• Core logic of reference implementation in C

Next to do

• Same for ASM
• Interface for both implementations