An interactive browser-based Ceasar Cipher encryption and decryption tool built with HTML, CSS, and JavaScript to demonstrate the fundamentals of classical cryptography.
This project was completed during the PERSEVERE Full MERN Stack Software Development Bootcamp as an introduction to encryption algorithms and string manipulation.
The application implements the Ceasar Cipher, one of the earliest known encryption techniques, allowing users to encode and decode messages by shifting each letter of the alphabet by a specified number of positions.
Although simple by modern standards, the Ceasar Cipher provides an excellent introduction to the concepts of substitution ciphers, encryption keys, and reversible transformations.
🔐 Try it here:
https://graceelliott8374-tech.github.io/ceasar-cipher/
- Encrypt plain text using a configurable shift value
- Decrypt encrypted messages
- Interactive browser interface
- Real-time text transformation
- Input validation
- Clean, responsive design
- HTML5
- CSS3
- JavaScript (ES6)
Building this project strengthened my understanding of:
- String manipulation
- Character encoding
- JavaScript loops
- Conditional logic
- User input validation
- Functions and modular code
- Fundamental cryptography concepts
More importantly, this project sparked my long-term interest in encryption and cybersecurity. Understanding how simple substitution ciphers work provided a foundation for learning more advanced encryption methods and modern cryptographic systems.
- Support for additional classical ciphers
- Frequency analysis visualization
- Brute-force attack demonstration
- ROT13 quick mode
- Cipher history
- Dark mode
- Improved accessibility
Coming soon.
Clone the repository:
git clone https://github.com/graceelliott8374-tech/ceasar-cipher.gitOpen index.html in your browser.
The Ceasar Cipher is named after Julius Caesar, who is believed to have used this substitution cipher to protect military communications. While it is no longer considered secure, it remains one of the most widely taught examples of classical cryptography and serves as an excellent introduction to encryption principles.
This project is available for educational and portfolio purposes.