File Hash Integrity Checker for Digital Forensics and Data Verification

Abstract

File Hash Integrity Checker is a lightweight desktop application designed to verify the integrity and authenticity of digital files through cryptographic hashing. Built using Python and Tkinter, the tool allows users to generate hash values (MD5, SHA-256, and SHA-512) for any selected file and compare them against a known reference hash to detect unauthorized modifications, corruption, or tampering. The application follows a clean separation of concerns, dividing the codebase into a GUI layer (app.py) for user interaction and a logic layer (hash_utils.py) that handles hash computation and comparison using Python's built-in hashlib library. To ensure scalability and reliability, the system reads files in chunks rather than loading them entirely into memory, allowing it to efficiently process files of any size from small text documents to large binary files without performance degradation. Upon computing a file's hash, the application instantly alerts the user whether the generated hash matches a provided reference value, offering a quick and reliable way to confirm file integrity. This makes the tool particularly useful for verifying software downloads, checking for file corruption during transfer, and validating that sensitive files have not been altered. Overall, this project demonstrates practical application of cryptographic principles, GUI development, and efficient file handling in Python, providing a simple yet effective solution for everyday file verification needs. The modular project structure and use of version control (Git/GitHub) also reflect standard software engineering practices suitable for further extension, such as adding drag-and-drop support, batch hashing, or additional hash algorithms.