Explore threshold ring signatures, their new definitions, and post-quantum security in this conference talk presented at PKC 2020. Delve into the paper by Abida Haque and Alessandra Scafuro, covering topics such as passive adversaries, post-quantum hardness assumptions, and proof techniques in post-quantum settings. Examine anonymity and unforgeability definitions, oracles, and post-quantum secure problems. Learn about key techniques including trapdoor commitment schemes, Shamir secret sharing, and the Unruh transformation. Conclude with a summary and questions for future research in this cutting-edge cryptographic field.