Encoder Decoder Application

The Encoder Decoder application is a Java program with a graphical user interface (GUI) that allows users to encode plaintext messages into ciphertext and decode ciphertext back into plaintext using various encoding algorithms.

Features

• Encode plaintext messages into ciphertext using different encoding algorithms.
• Decode ciphertext back into plaintext.
• Support for multiple encoding algorithms such as Caesar cipher, Base64 encoding, and custom substitution ciphers.
• User-friendly graphical interface for inputting messages, selecting encoding algorithms, and viewing the encoded or decoded output.

How to Run

1. Ensure you have Java installed on your PC. If not, download and install Java from here.
2. Download the editor.java file from this repository.
3. Open Command Prompt (on Windows) or Terminal (on macOS/Linux).
4. Navigate to the directory where the editor.java file is located.
5. Compile the Java source file using the following command:

   javac EncoderDecoder.java

6. Run the compiled Java program using the following command:

   java EncoderDecoder

Usage

Input Message: Enter the message you want to encode/decode into the input text area. Select Algorithm: Choose the encoding algorithm from the dropdown menu. Encode: Click the "Encode" button to encode the input message using the selected algorithm. Decode: Click the "Decode" button to decode the input message using the selected algorithm. Output Message: View the encoded or decoded message in the output text area.

Supported Algorithms

Caesar Cipher: Shifts each letter in the message by a fixed number of positions. Base64 Encoding: Converts binary data into ASCII text format.

Notes

• The application uses Java Swing for the graphical user interface.