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February 5th, 2019 happens to be Safer Internet Day, and Google is
celebrating by releasing an awesome security tool that’s available right away
for all Chrome browser users. What does it do? It looks at the username and
password combinations you’re using to sign into various online services and
warns you if the data is already in the possession of hackers. In other words,
the Password Check-up Chrome extension will tell you when you need to change
your password and every single person who uses Chrome should install it
immediately.
In light of the recent Collection hacks, the news
that Google’s
password checking tool can compare your username/password combos against a
database containing more than four billion leaked credentials is great. And
before you worry that your passwords need to travel the internet to Google’s
servers to perform the check, you should know that Google’s security team
worked with cryptographers at Stanford University to ensure that Google never
learns any of your usernames and passwords, and that any breach data stays safe
from wider exposure.
Once installed, the Password Check-up
tool will monitor all your logins and trigger warnings once a positive match
comes up. What’s great about the tool is that it should work with your current
password manager if you use one (you really, really should be using one). Also,
considering that the warning comes as soon as you’ve logged into an account,
you’ll be able to change the password immediately — and you should do so once
the warning arrives.
Google says it won’t bother you about
outdated passwords that you may have reset or dumb passwords you might be
using, like 123456 as long as they do not appear in a data breach. Of note,
Google will collect some anonymous data from your Password Checkup usage,
including “the number of lookups that surface an unsafe credential, whether an
alert leads to a password change and the web domain involved for improving site
compatibility.”
As for the actual password-matching
trickery that goes on behind the scenes, Google explains that the actual
password matching happens locally and Google will never know the
username/password you’re using.
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