That's the payments volume running over Visa's global network, a network whose vast global expanse is a tempting playground for cyberthieves. Visa's cybersecurity team, as Chief Information Security Officer Sunil Seshadri told Karen Webster, also logs as many as 8 billion security events every day -- that's billion with a "b." Not all events are intrusions or even attempts, but also include routine security logs and regular everyday network activity. These logs provide deep insight into what is happening in Visa's infrastructure and network on a real-time basis. But finding the signal in this noisy data is a challenge.