Explore an invited conference talk from the 19th Theory of Quantum Computation, Communication and Cryptography (TQC 2024) conference where Tomoyuki Morimae presents groundbreaking research on quantum cryptography approaches that do not rely on one-way functions. Delivered at the Okinawa Institute for Science and Technology (OIST) as part of a leading international gathering of theoretical quantum information science researchers, the 58-minute presentation advances the field's understanding of quantum cryptographic systems. Gain insights from this significant contribution to quantum information science, supported by industry leaders including JPMorganChase, Google Quantum AI, Horizon Quantum Computing, Quantinuum, and the Japan National Tourism Organization.