Encrypter

A basic encryption and decryption tool written in Bash using a custom substitution cipher.

This project was created to practice Bash scripting, focusing on string manipulation, arrays, and functions.

DISCLAIMER
This tool is intended strictly for educational purposes only. It implements a substitution cipher, which is a form of encryption that is not secure by modern standards and can be easily broken using frequency analysis. Do not use this for securing any real or sensitive data.

---

Features

• Encrypt and decrypt messages using a substitution key
• Fully written in Bash, no external tools required
• Menu-driven, beginner-friendly

---

Usage

• git clone https://github.com/Parin070/Encrypter
• cd Encrypter
• chmod +x encrypter.sh
• ./encrypter.sh

Example

Substitution key = 0ZyXwV9uTsRq8PoNmL7kJiHg6FeDcB5azYxW4vUtSr3QpOnM2lKjIh1GfEdCbA

Entered String = hello world!123
Encrypted message = uwqqo HoLqX!h1G

The script will not make any changes to whitespaces or special characters.