Explore the critical intersection of cryptography and usability in this 47-minute conference talk from linux.conf.au. Delve into Shannon's maxim and its implications for open-source cryptographic libraries. Discover how usability issues can undermine even the most robust cryptographic engineering, potentially leading developers to unknowingly create insecure systems. Learn about research findings on the impact of cryptographic library usability, common pitfalls in open-source cryptography projects, and strategies for library authors, maintainers, and communities to enhance user success. Gain valuable insights into improving the security of cryptographic implementations and fostering a more secure digital ecosystem.