[nightpool]

Second: Google Recaptcha Enterprise can use Homomorphic Encryption to check whether your password has been compromised (searching the set of all breached passwords without disclosing which individual password you want to check)

Now, in practice, HaveIBeenPwned does the exact same thing with a k-anonymity scheme based off of MD5 collisions, which is wayyyy easier in practice and what most people actually deploy, but the Google thing is cool too.