Term Kind Topic What it is
Private Set Intersection PSI, Private Join and Compute protocol Privacy-Enhancing Technologies A cryptographic protocol that lets two parties learn the size of - or an aggregate over - the overlap between their datasets without either learning the other's non-matching members.
Secure Aggregation Private Aggregation, Cohort-Level Aggregation protocol Privacy-Enhancing Technologies A cryptographic protocol that lets a server learn only the sum of many clients' model updates and never any single client's update, which is what makes an on-device training claim survive scrutiny.