Secure Password Vault using Kivy and FastAPI

Managing multiple passwords is one of the most common challenges faced by developers, system administrators, and users alike. We often deal with separate credentials for Unix servers, databases, and applications — and remembering each one can quickly become a burden.

Unfortunately, the most common coping methods are also the least secure:

• Writing passwords in a notepad file on a personal PC
• Storing them in mobile notes
• Scribbling them in a physical notebook

Each of these exposes you to potential security risks. For instance:

• During a screen-sharing session, your Unix or database password might be accidentally displayed or recorded.
• A colleague could see your credentials if your notebook is left open.
• Someone with access to your mobile device might view your notes and compromise your accounts.

To address this problem, I developed a simple password vault tool using Kivy for the front-end and FastAPI for encryption. This vault helps you securely view or copy passwords without ever displaying the actual text on screen.

How It Works

The tool stores encrypted passwords in a JSON file. Here’s an example format:

{"unix_login": "encryptedpassword1",  "database_login": "encryptedpassword2"}

The FastAPI component handles encryption and decryption. You supply a plain-text password, and the API returns an encrypted value, which you can store in the JSON file.

On the other side, the Kivy application reads the same JSON file. Instead of revealing the decrypted password visually, it allows you to copy it securely to the clipboard — preventing exposure even during screen sharing.

Kivy Vault Program — User Interface

FastAPI Program

Benefits

• Protects sensitive credentials from accidental leaks
• Simplifies password management across multiple platforms
• Avoids insecure storage methods like notes or text files
• Provides a usable interface for quick access and secure copying

This combination of FastAPI for secure encryption and Kivy for easy interaction creates a lightweight yet powerful personal vault tool for managing confidential credentials safely.