🔐 Encryption & Decryption System — Python CLI Tool

A command-line encryption and decryption tool supporting multiple BaseX encoding schemes: Base16, Base32, Base64, and Base85.
Developed in Python as an educational project for learning and demonstrating BaseX encoding techniques.

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📖 Introduction

The Encryption & Decryption System is a lightweight Python-based program that allows you to securely encode and decode messages using different BaseX encoding formats.
It supports:

• Base85 — highest density text encoding
• Base64 — common web encoding
• Base32 — used in DNS and authentication keys
• Base16 — hexadecimal representation

This is an interactive terminal program, perfect for practicing encoding techniques and understanding BaseX operations.

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✨ Features

🔒 Encryption

• Choose between Base85, Base64, Base32, or Base16
• Input any UTF-8 text
• Get an encoded string instantly

🔓 Decryption

• Decode Base85, Base64, Base32, or Base16 strings back to plain text
• Handles invalid inputs with error messages
• ASCII input validation for correct decoding

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📋 Supported Encodings

Encoding	Type	Purpose
Base85	Text encoding	High-density ASCII representation
Base64	Text encoding	Common in email/web data transfer
Base32	Text encoding	Used in DNS & authentication keys
Base16	Hexadecimal	Low-level data representation

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📂 Project Structure

Encryption_Decryption-main/
├── README.md         # Project documentation
├── encode.py         # Encryption script (Base85, Base64, Base32, Base16)
└── decode.py         # Decryption script (Base85, Base64, Base32, Base16)

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🛠 Installation Guide

1. Install Python:

   Ensure Python 3.8+ is installed:

   Download Python

2. Download or Clone the Project

   git clone https://github.com/LowZhiHorng/Encryption_Decryption.git
   cd Encryption_Decryption-main

3. Run the Program

   • For encryption:

     python encode.py

   • For decryption:

     python decode.py

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🚀 Usage

🔒 Encrypting a Message

$ python encode.py

Encryption System

1. Base 85 Encryption
2. Base 64 Encryption
3. Base 32 Encryption
4. Base 16 Encryption

What's your choice? (1/2/3/4): 2
Encryption message: Hello World
Encrypted message: SGVsbG8gV29ybGQ=

🔓 Decrypting a Message

$ python decode.py

Decryption System

1. Base 85 Decryption
2. Base 64 Decryption
3. Base 32 Decryption
4. Base 16 Decryption

What's your choice? (1/2/3/4): 2
Decryption message: SGVsbG8gV29ybGQ=
Decrypted message: Hello World

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❗ Troubleshooting

Module not found → Ensure you are running Python 3.8+ and have no typos in file names.

UnicodeDecodeError during decryption → Make sure you select the correct encoding type for the message.

Invalid choice → Only enter 1, 2, 3, or 4 when prompted.

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📜 License

This project is licensed under the

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👤 Author

Low Zhi Horng

📂 GitHub: