Explore the intricacies of multiphoton and side-channel attacks in mistrustful quantum cryptography through this 55-minute seminar presented by Damián Pitalúa-García from the Centre for Quantum Information and Foundation at the University of Cambridge. Delivered on September 22, 2023, as part of the "2023-24 Quantum Information Seminar" series at the Fields Institute, this talk delves into advanced concepts in quantum cryptography and potential vulnerabilities in quantum communication systems. Gain insights into cutting-edge research and developments in the field of quantum information security.