File Integrity & Encryption Tool

A desktop security application built in Java that provides file integrity verification and AES-256 file encryption.

Features

• Compute MD5, SHA-256, and SHA-512 hashes for any file
• Save a hash baseline and verify file integrity at any time
• Detect file tampering by comparing hashes
• Encrypt files using AES-256-CBC with a password
• Decrypt previously encrypted files with the correct password

Security Design

• AES-256-CBC encryption with a unique random IV per operation
• PBKDF2WithHmacSHA256 key derivation with 65,536 iterations
• Unique random salt per encryption to defeat rainbow table attacks
• Salt and IV stored in the encrypted file header (non-secret)
• Password never stored or written to disk

Architecture

model/    → Data objects (FileRecord, EncryptionResult)
core/     → Cryptographic engines (HashEngine, EncryptionEngine, FileManager)
service/  → Orchestration layer (IntegrityService, EncryptionService)
ui/       → Swing GUI (MainWindow, HashPanel, EncryptPanel)

Requirements

• Java 17 or higher

How To Run

1. Clone the repository
2. Open in IntelliJ IDEA
3. Run Main.java

Tech Stack

• Java 21
• Java Swing
• javax.crypto — AES-256-CBC encryption
• java.security.MessageDigest — MD5, SHA-256, SHA-512 hashing
• PBKDF2WithHmacSHA256 — secure key derivation