Video lectures for Alfred Menezes's introductory course on real-world deployments of cryptography. Topics covered: Review of symmetric-key and public-key primitives, secure channels, publicly-verifiable authentication, GSM, SIM cards, SONY playstation, challenges with key establishment, key management, and key updates Lecture playlist: Course web page: The slides are available on the course web page. Other cryptography courses: Slides 00:00 Introduction 00:42 Slide 3: Symmetric-key cryptography 01:29 Slide 4: Public-key cryptography 02:12 Slide 5: Two common security objectives 02:42 Slide 6: Secure channels 05:03 Slide 7: Publicly-verifiable authentication 06:49 Slide 8: GSM: introduction 07:29 Slide 9: GSM: security objectives 08:41 Slide 10: GSM: key distribution 09:39 Slide 11: GSM: security protocol 11:08 Slide 12: Two limitations of GSM 12:30 Slide 13: SONY Playstation 14:59 Slide 14: Challenges with large-scale deployments of cryptography 17:25 Slide 15: Roadmap