Explore the vulnerabilities in next-generation roaming networks through this Black Hat conference talk. Delve into the workings of Diameter-based networks, examining their messages and functions, and uncover potential exploits attackers could leverage. Learn about signaling between providers, security research, and the properties of 4G networks. Compare Diameter with SS7 protocols, and understand techniques for tracking subscribers, data transport, billing fraud, and denial of service attacks. Discover tools for Diameter enumeration and gain insights into host spoofing and message cross-checking. Conclude with recommendations for securing these networks and participate in a Q&A session to deepen your understanding of next-gen roaming network security.