Purse

Abstract

1. Introduction

Purse is a Bash shell script based on drduh/pwd.sh.

Both programs use GnuPG to manage secrets in encrypted text files. Purse is based on asymmetric (public-key) authentication, while pwd.sh is based on symmetric (passphrase-based) authentication.

Purse eliminates the need for a passphrase: plug in the YubiKey, enter PIN and touch it to access secrets.

2. Objective

Manage secrets with Bash and GnuPG asymmetric encryption (YubiKey)

This project demonstrates how Shell can be applied to a real-world Cybersecurity & Ethical Hacking problem.

4. Technology Stack

5. System Requirements

General requirements for this technology stack — check the README for exact versions.

• Linux / macOS terminal or WSL on Windows
• Git (to clone the repository)

6. Installation & Setup

git clone https://github.com/drduh/Purse.git
cd Purse

wget https://github.com/drduh/Purse/blob/master/purse.sh

Full 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.

1. Which threat or attack does this project defend against?
2. What detection or protection technique is used and what are its limits?
3. How are false positives and false negatives handled?
4. Which cryptographic algorithms or security standards are involved?
5. What legal and ethical rules apply when testing a tool like this?

9. Source Code & License

This project is developed by drduh 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.