Overview

This Java application demonstrates a simple implementation of a messaging system with encryption and decryption functionalities, using a Swing graphical user interface (GUI). The application is divided into two main parts: Receiver and Sender, each represented as separate classes in the package Application. Additionally, it utilizes a custom UI component VerticalFlowLayout from the UIs package for layout management.

Components

1. Receiver: Handles the display and decryption of received messages and files.

   • Displays decrypted data, key, and plaintext in text areas.
   • Uses a BufferedReader to read decrypted data from a file.

2. Sender: Manages sending messages and files with encryption.

   • Provides a GUI with two tabs: one for sending messages and another for sending files.
   • Implements file selection and encryption/decryption through JFileChooser and custom encryption logic.

3. Key_generator_UI: A utility class for generating and displaying encryption keys (not fully detailed in the provided code).

4. Key_generator: A utility class for encryption key management (assumed based on context).

5. Locker: A class used for file encryption and decryption (assumed based on context).

GUI Layout

• The Receiver and Sender classes each create a JFrame with various components like JLabel, TextArea, and JButton.
• VerticalFlowLayout is used to arrange components vertically.
• In Sender, a JTabbedPane is used to separate the message sending and file sending functionalities.

Encryption & Decryption Process

• The application seems to involve a process of encrypting and decrypting messages and files, although the specifics of the encryption algorithm are not detailed in the provided code.
• Key_generator is assumed to play a crucial role in managing encryption keys.

Setup and Execution

1. Prerequisites: Ensure Java is installed on your system.
2. Compilation: Compile the Java files in the Application and UIs packages.
3. Running the Application: Run the Sender class to start the application. It will also instantiate the Receiver part of the application.