https://github.com/mathiscode/password-leak-monitor

A browser addon that automatically and securely monitors all passwords used and alerts you if it has been included in any data breaches
https://github.com/mathiscode/password-leak-monitor

browser-extension haveibeenpwned password-safety security-tools

Last synced: 7 months ago
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A browser addon that automatically and securely monitors all passwords used and alerts you if it has been included in any data breaches

• Host: GitHub
• URL: https://github.com/mathiscode/password-leak-monitor
• Owner: mathiscode
• License: mit
• Created: 2019-05-11T13:55:35.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2022-02-10T18:13:57.000Z (over 3 years ago)
• Last Synced: 2025-02-28T16:10:57.396Z (7 months ago)
• Topics: browser-extension, haveibeenpwned, password-safety, security-tools
• Language: JavaScript
• Homepage:
• Size: 1.57 MB
• Stars: 6
• Watchers: 2
• Forks: 0
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • Contributing: CONTRIBUTING.md
  • Funding: .github/FUNDING.yml
  • License: LICENSE
  • Security: SECURITY.md

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README

          

# Password Leak Monitor

[![Sponsor](https://img.shields.io/badge/Sponsor-my%20work-success)](https://github.com/sponsors/mathiscode)

[![Mozilla Add-on](https://img.shields.io/amo/v/password-leak-monitor.svg)](https://addons.mozilla.org/en-US/firefox/addon/password-leak-monitor)

[![Mozilla Add-on](https://img.shields.io/amo/users/password-leak-monitor.svg)](https://addons.mozilla.org/en-US/firefox/addon/password-leak-monitor)

[![Mozilla Add-on](https://img.shields.io/amo/dw/password-leak-monitor.svg)](https://addons.mozilla.org/en-US/firefox/addon/password-leak-monitor)

[![Mozilla Add-on](https://img.shields.io/amo/stars/password-leak-monitor)](https://addons.mozilla.org/en-US/firefox/addon/password-leak-monitor)

[![Build Status](https://travis-ci.org/mathiscode/password-leak-monitor.svg?branch=master)](https://travis-ci.org/mathiscode/password-leak-monitor)

[![GitHub license](https://img.shields.io/github/license/mathiscode/password-leak-monitor.svg?color=blue)](https://github.com/mathiscode/password-leak-monitor/blob/master/LICENSE)

[![Standardjs](https://img.shields.io/badge/code_style-standard-blue.svg)](https://standardjs.com)

[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-blue.svg)](https://github.com/mathiscode/password-leak-monitor/compare)

[![Tweet](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?text=Make%20sure%20your%20passwords%20are%20safe&url=https://github.com/mathiscode/password-leak-monitor#readme&hashtags=firefox,chrome,passwords,security)

A browser addon that automatically monitors all passwords used and alerts you if it has been included in any data breaches.

### [Download for Firefox](https://addons.mozilla.org/en-US/firefox/addon/password-leak-monitor)

Also check out the [password-leak](https://github.com/mathiscode/password-leak) JavaScript library!

---

## How is this safe?

Your passwords are **NEVER** transmitted to any other system. This addon makes use of the [Have I Been Pwned API](https://haveibeenpwned.com/API/), which implements a [k-Anonymity Model](https://en.wikipedia.org/wiki/K-anonymity) so your password can be checked without ever having to give your password to any other party.

## How does it work?

It's a fairly simple extension: for every password you enter, a call is made to [Have I Been Pwned](https://haveibeenpwned.com/API/v2#PwnedPasswords) with the first five characters of your _hashed_ password. A list of potential matches is returned, and the addon determines if your hashed password matches any of the compromised hashes.