57-password-manager

57 - Secure Password Manager

What It Does

A command-line password manager that securely stores credentials. It generates a strong encryption key, encrypts your passwords using Fernet (symmetric encryption), and saves them locally. You must provide the correct master key to retrieve and decrypt your passwords.

Project Structure

57-password-manager/
  manager.py           # Main CLI application
  requirements.txt     # Python dependencies
  README.md            # This file

Setup and Run

1. Install dependencies

pip install -r requirements.txt

2. Generate a Master Key (Do this once!)

python manager.py generate-key

Save the generated key file (secret.key) in a safe place. If you lose it, you lose access to all your passwords.

3. Add a Password

python manager.py add --service GitHub --username octocat --password supersecret123

4. Retrieve a Password

python manager.py get --service GitHub

Core Concepts

• Symmetric Encryption using the cryptography.fernet module
• Key generation and secure file storage
• Command-line parsing with Python's built-in argparse
• Secure data serialization via JSON files
• Handling InvalidToken exceptions for incorrect keys

What You Will Learn

You will learn how to apply real-world cryptography to protect sensitive user data. You'll understand the importance of encryption keys, how symmetric encryption works, and how to build a robust CLI tool for managing local secrets.

Example Output

$ python manager.py generate-key
Key generated and saved to secret.key. Keep it safe!

$ python manager.py add --service Gmail --username myemail@gmail.com --password "P@ssw0rd!"
Successfully added credentials for Gmail.

$ python manager.py get --service Gmail
Service: Gmail
Username: myemail@gmail.com
Password: P@ssw0rd!