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2 months agoIt’s taking a video and doing aligning/stacking of the frames like you said. Not taking an actual long exposure in the sensor. Most photos on modern phone cameras in low light are done this way. There’s a cool paper by google on their algorithm.
More details about the k-anonimity process. https://blog.cloudflare.com/validating-leaked-passwords-with-k-anonymity/
The short answer is that they download a partial list of passwords that hash to values starting with the same 5 characters as yours and then check if your password hash is in that list locally. This gives the server very little information about your password if it was not breached and more if it was (but then you should change it anyway), making an elegant compromise