Recorded 25 July 2022. Jonathan Katz of the University of Maryland presents "Introduction to Cryptography II" at IPAM's Graduate Summer School Post-quantum and Quantum Cryptography. Abstract: This session will focus on public-key cryptography, including key exchange, public-key encryption, and digital signatures. I will also discuss the random-oracle model and its applications to constructing public-key cryptosystems. Part II: Suggested readings: Katz & Lindell, "Introduction to Modern Cryptography (3rd edition)," Sections 6.5, 11.3, 12.1-12.3, and 13.1-13.5. Learn more online at: https://www.ipam.ucla.edu/programs/summer-schools/graduate-summer-school-on-post-quantum-and-quantum-cryptography/?tab=overview