Abstract
Hat Sh is an open-source Cybersecurity & Ethical Hacking project. Encrypt and Decrypt files securely in your browser. Hat.sh is a web app that provides secure local file encryption in the browser. It's fast, secure, and uses modern cryptographic algorithms with chunked AEAD stream encryption/decryption. It is built using JavaScript, Serverless. Key capabilities include: Secure multiple file encryption/decryption with passwords or keys; Secure random password generation; Asymmetric key pair generation. The complete source code is publicly available on GitHub under the MIT License, making it a useful reference for students building a Cybersecurity & Ethical Hacking mini project or final-year project.
1. Introduction
Hat.sh is a web app that provides secure local file encryption in the browser. It's fast, secure, and uses modern cryptographic algorithms with chunked AEAD stream encryption/decryption.
V2 of hat.sh introduced memory efficient in-browser large file chunked encryption using streams with libsodium.
The libsodium library is used for all cryptographic algorithms.
2. Objective
Encrypt and Decrypt files securely in your browser.
This project demonstrates how JavaScript, Serverless can be applied to a real-world Cybersecurity & Ethical Hacking problem.
3. Key Features / Modules
- Secure multiple file encryption/decryption with passwords or keys.
- Secure random password generation.
- Asymmetric key pair generation.
- Authenticated key exchange.
- Password strength estimation.
4. Technology Stack
5. System Requirements
General requirements for this technology stack — check the README for exact versions.
- Node.js (LTS) and npm
- A modern web browser
- VS Code or any code editor
- Git (to clone the repository)
6. Installation & Setup
git clone https://github.com/sh-dv/hat.sh.git
cd hat.shFull setup instructions are in the project README.
7. Future Enhancements
Suggested extensions you can add to make this your own project.
- Add logging and alert notifications (email / Telegram)
- Write a threat model document for the tool
- Package it with Docker for safe lab testing
8. Viva / Review Questions
Common questions examiners ask for projects in this domain.
- Which threat or attack does this project defend against?
- What detection or protection technique is used and what are its limits?
- How are false positives and false negatives handled?
- Which cryptographic algorithms or security standards are involved?
- What legal and ethical rules apply when testing a tool like this?
9. Source Code & License
This project is developed by sh-dv and published on GitHub under the MIT License. Please follow the license terms and credit the original author when you use or modify this code.
Want to build this as your internship project?
Work on a Cybersecurity & Ethical Hacking project like this with mentor guidance, weekly reviews and an internship certificate from Training Trains, Erode — online or offline.
Apply for Cybersecurity & Ethical Hacking Internship