The deprecation of third-party cookies and reduction of browser fingerprint ability are important wins for consumer privacy. However, sophisticated ad fraud profits from anonymity. Malware and botnet operators covet privacy, and prefer that the machines they infect blend into the crowd. While marketers will inevitably adopt alternative strategies for audience attribution and remarketing, security vendors face rising challenges in adapting protective technologies for adversaries who will become increasingly privacy-protected and therefore increasingly untraceable. What does privacy compliant data sharing for protection from digital fraud and abuse require? How should we measure incremental support for privacy in terms of impact to security? This segment focuses on the future of privacy sensitive security to answer these questions and presents a common cause for collaboration across the AdTech community and beyond.