🔐 Project Overview

This repository contains the implementation, testing, and performance evaluation of three fundamental cryptographic algorithms — AES (Advanced Encryption Standard), RSA (Rivest–Shamir–Adleman), and SHA-256 (Secure Hash Algorithm). It was developed as part of the IE3082 – Cryptography module for the B.Sc. (Hons) in Information Technology (Cyber Security) degree program at the Sri Lanka Institute of Information Technology (SLIIT).

The project aligns with ISO/IEC 27001:2022 Annex A.10 – Cryptographic Controls, focusing on maintaining confidentiality, integrity, and authenticity in information systems.

⚙️ Key Features

✅ AES encryption/decryption with HMAC-SHA256 authentication

✅ RSA public/private key generation and encryption

✅ SHA-256 and HMAC-SHA-256 hashing with tamper detection

✅ Performance analysis across variable key sizes and input sizes

✅ Visual graphs comparing execution times for AES, RSA, and SHA-256

✅ Python-based, easy to modify and extend for security education or research

🧠 Technologies Used

Language: Python 3.10

Libraries: PyCryptodome, hashlib, hmac, matplotlib

Environment: Windows 10 / Jupyter Notebook