🔐 Encryption & Decryption Tool (Java Swing)

A secure Java desktop application for encrypting and decrypting text and files using modern cryptographic standards.

📌 Overview

The Encryption & Decryption Tool is a desktop application developed in Java Swing that enables users to securely encrypt and decrypt both text and binary files using password-based encryption.

Unlike many academic encryption projects that only support text files, this application is designed to work with virtually any file type including:

PDF
DOCX
ZIP
PNG
JPG
EXE
MP4
MP3
TXT
and many more.

The project combines a user-friendly graphical interface with modern cryptographic techniques such as AES-256 GCM, PBKDF2, and SHA-256 to provide confidentiality, authentication, and integrity verification.

✨ Features

🔒 Text Encryption

Encrypt plain text
Decrypt encrypted text
Password-based encryption
AES-GCM authenticated encryption
Base64 encoded encrypted output

📁 File Encryption

Supports encryption and decryption of almost every file type:

📄 PDF
🖼 JPG
🖼 PNG
📦 ZIP
📄 DOCX
🎵 MP3
🎬 MP4
⚙ EXE
📃 TXT
Any binary file

🛡 Security Features

AES-256 GCM Encryption
PBKDF2 Password Key Derivation
120000 PBKDF2 Iterations
Random Salt Generation
Random Initialization Vector (IV)
SHA-256 Integrity Verification
Authentication Failure Detection
Password-Based Encryption
Binary-Safe Encryption
Secure Encrypted File Container

🖥 GUI Features

Java Swing Interface
Input Text Area
Output Text Area
Password Field
Encrypt Text Button
Decrypt Text Button
Encrypt File Button
Decrypt File Button
Copy Output Button
Clear Button
Status Bar
File Chooser Integration

📸 Screenshots

Main Application

Replace these screenshots with your latest screenshots if necessary.

Main Window

Image Encryption

PDF Encryption

ZIP Encryption

🏗 Project Architecture

                +--------------------+
                |   Java Swing GUI   |
                +---------+----------+
                          |
                          |
                          ▼
                 EncryptionFrame.java
                          |
                          |
                          ▼
            FileEncryptionService.java
                          |
                          |
                          ▼
                 CryptoUtils.java
                          |
      +-------------------+------------------+
      |                                      |
      ▼                                      ▼
 AES-256 GCM                         PBKDF2 Key Derivation
 Encryption                           SHA-256 Integrity

📂 Project Structure

encryption-decryption-tool-java-gui
│
├── screenshots/
│   ├── phase7.png
│   ├── imagenc.png
│   ├── pdfenc.png
│   └── zip.png
│
├── sample_files/
│   ├── test.txt
│   ├── test.txt.enc
│   └── test.txt.enc.dec
│
├── src/
│   │
│   ├── crypto/
│   │     ├── CryptoUtils.java
│   │     ├── CryptoException.java
│   │     └── DecryptedData.java (if separated)
│   │
│   ├── service/
│   │     └── FileEncryptionService.java
│   │
│   ├── gui/
│   │     └── EncryptionFrame.java
│   │
│   ├── main/
│   │     ├── Main.java
│   │     └── CryptoTest.java
│   │
│   └── utils/
│         └── (Optional logging utilities)
│
├── README.md
└── LICENSE

🛠 Technology Stack

Category	Technology
Language	Java
GUI	Java Swing
Encryption	AES-256 GCM
Key Derivation	PBKDF2WithHmacSHA256
Integrity	SHA-256
Randomness	SecureRandom
Build Tool	javac
IDE	VS Code / IntelliJ IDEA
Platform	Windows / Linux / macOS

🔐 Cryptography Used

AES-256 GCM

AES (Advanced Encryption Standard) is one of the world's most trusted symmetric encryption algorithms.

This project uses:

AES-256
GCM Mode
NoPadding

AES-GCM provides:

Confidentiality
Authentication
Integrity Protection

PBKDF2

Instead of directly using the password as an encryption key, this project derives a secure key using:

PBKDF2WithHmacSHA256
120000 iterations
Random 16-byte salt
256-bit key generation

This significantly improves resistance against brute-force and dictionary attacks.

SHA-256

SHA-256 is used to verify file integrity after decryption.

The application detects:

File tampering
Data corruption
Authentication failures
Wrong passwords

🚀 Key Highlights

Modern AES-GCM authenticated encryption
Binary-safe encryption for any file type
Password-based key derivation with PBKDF2
SHA-256 integrity verification
User-friendly Java Swing desktop interface
Clean modular project structure
Suitable for educational and portfolio purposes

⚙ Installation

Prerequisites

Before running the project, ensure the following software is installed:

Java JDK 17 or later
Git
VS Code / IntelliJ IDEA (Recommended)

Verify Java installation:

java -version
javac -version

📥 Clone Repository

git clone https://github.com/vyawaha/encryption-decryption-tool-java-gui.git

Move into the project directory:

cd encryption-decryption-tool-java-gui

▶ Compile Project

Open Terminal / PowerShell inside the src directory.

cd src

javac crypto/*.java service/*.java gui/*.java main/*.java

▶ Run Application

java main.Main

The Java Swing GUI will launch.

🚀 How to Use

1️⃣ Text Encryption

Launch the application.
Enter plain text into the Input Text area.
Enter a password.
Click Encrypt Text.
The encrypted output is displayed in the Output Text area.

2️⃣ Text Decryption

Paste encrypted text into the Input Text area.
Enter the same password used during encryption.
Click Decrypt Text.
The original text appears in the Output Text area.

3️⃣ File Encryption

Click Encrypt File.
Select any supported file.
Enter a password.
The encrypted file is saved with:

filename.ext.enc

Example:

report.pdf

becomes

report.pdf.enc

4️⃣ File Decryption

Click Decrypt File.
Select the encrypted file.

Example:

report.pdf.enc

Enter the correct password.
The decrypted file is restored.

📁 Supported File Types

The application supports virtually every binary and text file format.

Category	Examples
Documents	PDF, DOC, DOCX, TXT
Images	PNG, JPG, JPEG, BMP
Archives	ZIP, RAR (as binary data)
Audio	MP3, WAV
Video	MP4, AVI
Executables	EXE
Source Code	Java, Python, C, C++, HTML
Others	Any binary file

🔄 Encryption Workflow

User Input
     │
     ▼
Password
     │
     ▼
PBKDF2 Key Derivation
     │
     ▼
AES-256 GCM Encryption
     │
     ▼
Encrypted Container
     │
     ▼
Save .enc File

🔓 Decryption Workflow

Encrypted File
      │
      ▼
Read Container
      │
      ▼
Verify Header
      │
      ▼
Generate AES Key
      │
      ▼
AES-GCM Authentication
      │
      ▼
SHA-256 Integrity Check
      │
      ▼
Restore Original File

📦 Secure Encrypted File Format

Each encrypted file stores the following information:

+------------------------------------------------------+
| MAGIC HEADER                                         |
+------------------------------------------------------+
| VERSION                                               |
+------------------------------------------------------+
| ORIGINAL FILE NAME                                    |
+------------------------------------------------------+
| ORIGINAL FILE SIZE                                    |
+------------------------------------------------------+
| SHA-256 HASH                                          |
+------------------------------------------------------+
| RANDOM SALT                                            |
+------------------------------------------------------+
| RANDOM IV                                              |
+------------------------------------------------------+
| AES-GCM ENCRYPTED DATA                                 |
+------------------------------------------------------+

This design allows the application to validate encrypted files before decryption and detect corruption or incorrect passwords.

🧪 Example Test Cases

✅ Text Encryption

Input:

Hello Encryption Tool

Password:

password123

Output:

RU5DUg...

✅ File Encryption

Input:

photo.jpg

Output:

photo.jpg.enc

✅ PDF Encryption

Input:

document.pdf

Output:

document.pdf.enc

✅ ZIP Encryption

Input:

archive.zip

Output:

archive.zip.enc

❌ Wrong Password

Attempting to decrypt with an incorrect password results in an authentication failure, preventing unauthorized access to the original data.

📈 Project Progress

Phase	Status
Project Setup	✅
Java Swing GUI	✅
AES Encryption Module	✅
GUI Integration	✅
File Encryption	✅
Binary Safe Encryption	✅
Secure File Workflow	✅
Secure Encryption Container	✅

💡 Design Principles

This project was built with the following objectives:

Modular architecture
Separation of GUI and cryptographic logic
Reusable encryption utilities
Binary-safe file processing
Password-based security
Clean and maintainable Java code
Beginner-friendly project structure suitable for learning and portfolio demonstration

📂 Project Structure

encryption-decryption-tool-java-gui/
│
├── src/
│   ├── crypto/
│   │   ├── CryptoUtils.java
│   │   ├── CryptoException.java
│   │   └── ...
│   │
│   ├── gui/
│   │   ├── EncryptionFrame.java
│   │   └── ...
│   │
│   ├── service/
│   │   ├── FileEncryptionService.java
│   │   └── ...
│   │
│   └── main/
│       ├── Main.java
│       └── CryptoTest.java
│
├── screenshots/
│   ├── phase1.png
│   ├── phase2.png
│   ├── phase3.png
│   ├── phase4.png
│   ├── phase5.png
│   ├── phase6.png
│   ├── phase7.png
│   ├── imagenc.png
│   ├── pdfenc.png
│   └── zip.png
│
├── sample_files/
│
├── README.md
│
└── LICENSE

⚙️ Installation

Clone Repository

git clone https://github.com/vyawaha/encryption-decryption-tool-java-gui.git

Open Project

Open in

IntelliJ IDEA
Eclipse
VS Code

Compile

cd src

javac crypto/*.java service/*.java gui/*.java main/*.java

Run

java main.Main

💻 Application Workflow

Text Encryption

Enter plain text
Enter password
Click Encrypt Text
Copy encrypted text

Text Decryption

Paste encrypted text
Enter same password
Click Decrypt Text
Original text is restored

File Encryption

Click Encrypt File
Select any file
Choose password
Encrypted file (.enc) is created

File Decryption

Click Decrypt File
Select encrypted file
Enter correct password
Original file is restored

🛡 Security Features

AES-256 Encryption
GCM Authenticated Encryption
PBKDF2-HMAC-SHA256
Random Salt
Random IV
SHA-256 Integrity Verification
Password-Based Key Derivation
Authentication Failure Detection
Binary Safe Encryption
Secure Container Format
Base64 Support for Text Encryption
Cross Platform Compatibility

🖥 GUI Features

Java Swing Interface
Dual Text Panels
Password Field
Encrypt Button
Decrypt Button
Copy Output
Clear Output
Encrypt File
Decrypt File
Status Bar
Error Dialogs
Success Notifications
File Chooser Integration

📄 Supported File Types

This application supports encryption of virtually any file because it works directly with binary data.

Examples include:

TXT
PDF
DOC
DOCX
XLS
XLSX
PPT
PPTX
JPG
JPEG
PNG
GIF
BMP
MP3
WAV
MP4
AVI
ZIP
RAR
7Z
EXE
DLL
ISO
CSV
JSON
XML
HTML
CSS
Java Files
Python Files
C++
Any Binary File

📸 Project Screenshots

Application

Binary File Encryption

Image Encryption

PDF Encryption

ZIP Encryption

Crypto Module Testing

Successful Encryption and Decryption

Wrong Password Detection

🧪 Testing

The application has been tested with multiple text inputs and binary file formats to verify correctness, integrity, and authentication.

Text Encryption Tests

✅ Plain text encryption
✅ Plain text decryption
✅ Unicode text support
✅ Large text encryption
✅ Empty input validation
✅ Wrong password detection
✅ Authentication failure handling

File Encryption Tests

✅ TXT Files
✅ PDF Files
✅ JPG Images
✅ PNG Images
✅ ZIP Archives
✅ Java Source Files
✅ Binary Files

Security Tests

✅ Random Salt Generation
✅ Random IV Generation
✅ AES-GCM Authentication Tag Verification
✅ SHA-256 Integrity Verification
✅ Password-Based Key Derivation
✅ Tampered File Detection

🚀 Future Improvements

The project can be extended with several enterprise-grade capabilities.

Planned Features

Dark Mode UI
Drag & Drop File Support
Batch File Encryption
Folder Encryption
Recursive Directory Encryption
Progress Bar
Multi-threaded Encryption
Secure File Deletion
Compression Before Encryption
Digital Signatures
Public Key (RSA/ECC) Encryption
Hardware Security Module (HSM) Support
Cloud Storage Integration
Automatic Update Checker
Cross-Platform Installer
Command Line Interface (CLI)
Logging Dashboard
Plugin Architecture
Internationalization (i18n)
Unit Testing with JUnit

📚 Concepts Demonstrated

This project demonstrates practical implementation of several important computer science and cybersecurity concepts.

Cryptography

Symmetric Encryption
AES-256
AES-GCM
PBKDF2
Secure Random Number Generation
SHA-256 Hashing
Authentication Tags
Password-Based Encryption

Java Programming

Object-Oriented Programming
Exception Handling
File I/O
Byte Streams
Swing GUI Development
Event Handling
Java NIO
Modular Architecture

Software Engineering

Layered Architecture
Separation of Concerns
Reusable Utility Classes
Service Layer Design
Error Handling
Maintainable Code Structure

🎯 Learning Outcomes

Through this project, the following skills were applied:

Java Swing GUI Development
Cryptography Fundamentals
Secure Password-Based Encryption
Binary File Processing
Java NIO File Operations
Exception Handling
Secure Coding Practices
Desktop Application Development
Software Architecture
Git & GitHub Workflow

🤝 Contributing

Contributions are welcome.

If you would like to improve this project:

Fork the repository.
Create a new feature branch.
Commit your changes.
Push the branch.
Open a Pull Request.

⭐ Support

If you found this project helpful:

⭐ Star the repository

🍴 Fork the repository

🐞 Report bugs

💡 Suggest new features

👨‍💻 Author

Muktai Vyawahare

Computer Science Engineering Student

GitHub: https://github.com/vyawaha/encryption-decryption-tool-java-gui.git

📜 License

This project is licensed under the MIT License.

You are free to use, modify, and distribute this software in accordance with the terms of the license.

🙏 Acknowledgements

This project was inspired by modern encryption utilities and built using Java's standard cryptography libraries.

Special thanks to the Java community and open-source ecosystem for providing excellent documentation and APIs.

⭐ If you like this project, please consider giving it a Star! ⭐

Made with ❤️ using Java, Swing, and AES-256 Cryptography

Name		Name	Last commit message	Last commit date
sample_files		sample_files
screenshots		screenshots
src		src
.gitignore		.gitignore
README.md		README.md

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🔐 Encryption & Decryption Tool (Java Swing)

📌 Overview

✨ Features

🔒 Text Encryption

📁 File Encryption

🛡 Security Features

🖥 GUI Features

📸 Screenshots

Main Application

Main Window

Image Encryption

PDF Encryption

ZIP Encryption

🏗 Project Architecture

📂 Project Structure

🛠 Technology Stack

🔐 Cryptography Used

AES-256 GCM

PBKDF2

SHA-256

🚀 Key Highlights

⚙ Installation

Prerequisites

📥 Clone Repository

▶ Compile Project

▶ Run Application

🚀 How to Use

1️⃣ Text Encryption

2️⃣ Text Decryption

3️⃣ File Encryption

4️⃣ File Decryption

📁 Supported File Types

🔄 Encryption Workflow

🔓 Decryption Workflow

📦 Secure Encrypted File Format

🧪 Example Test Cases

✅ Text Encryption

✅ File Encryption

✅ PDF Encryption

✅ ZIP Encryption

❌ Wrong Password

📈 Project Progress

💡 Design Principles

📂 Project Structure

⚙️ Installation

Clone Repository

Open Project

Compile

Run

💻 Application Workflow

Text Encryption

Text Decryption

File Encryption

File Decryption

🛡 Security Features

🖥 GUI Features

📄 Supported File Types

📸 Project Screenshots

Application

Binary File Encryption

Image Encryption

PDF Encryption

ZIP Encryption

Crypto Module Testing

Successful Encryption and Decryption

Wrong Password Detection

🧪 Testing

Text Encryption Tests

File Encryption Tests

Security Tests

🚀 Future Improvements

Planned Features

📚 Concepts Demonstrated

Cryptography

Java Programming

Software Engineering