Learn about privacy-preserving authenticated key exchange (PPAKE) and its application to the Internet Key Exchange version 2 (IKEv2) protocol in this conference talk presented at PKC 2020. Explore the classical key exchange setting, multi-homed servers, and the general case before delving into the motivation for PPAKE. Discover the contributions and overview of the security model, including attack capabilities, security experiment, and guarantees. Examine the applicability to other security models, focusing on IPsec with signature-based authentication. Gain insights into Phase 2 of the protocol and the PPAKE security proof before reaching the conclusion of this informative presentation on cryptographic key exchange protocols.