Scaling up victim notification, because crededential theft is scaling up too... (WHY2025)

How do you scale up victim notifications from a couple of hundreds, to thousands, to millions to billions of stolen credentials? Credential theft is on the rise. Cybercriminals are gettings smarter and more efficient. Why hack in, if you can log in? At the DIVD we see this trend in the cases where we assist with notifying victims of credential theft. Where our first such cases started with a mere threehundred-something credentials we are now sometimes faced with credential dumps that contains millions of even billions of credentials. How can we scale this up, what problems did we face, how did we solve them, and what haven;t we solved yet? Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://program.why2025.org/why2025/talk/KUVEEL/