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Mozilla’s new service tries to wipe your data off the web
(www.theverge.com)
This is a most excellent place for technology news and articles.
The front page there is literally: "Give us your email, so we can find leaks of your email." It's exactly the same thing.
They are talking about the password lookup: https://haveibeenpwned.com/Passwords
But, it's the same deal. You have to trust they are actually doing what they say. Mozilla uses haveibeenpwned for their basic Monitor service too.
To be fair, you can check the code they run or just use the API.
The hash is calculated locally, cut-off and then send, the server returns all hashes it found which start with your one and then you can check if yours in in the list locally.
ah yes. type your password in here we totally wont steal it
Y'know that you can see the requests your browser makes, right? Mind putting in here a screenshot of HIBP uploading your password or any complete hash of it?
Failing to provide that grants you the "talking shit out of ya ass" award.