Usability and Security Effects of Code Examples on Crypto APIs

Context: Cryptographic APIs are said to be not usable and researchers suggest to add example code to the documentation. Aim: We wanted to create a free platform for cryptographic code examples that improves the usability and security of created applications by non security experts. Method: We created the open-source web platform CryptoExamples and conducted a controlled experiment where 58 students added symmetric encryption to a Java program. We then measured the usability and security. Results: The participants who used the platform were not only significantly more effective $( +73$ %) but also their code contained significantly less possible security vulnerabilities (-66 %). Conclusions: With CryptoExamples the gap between hard to change API documentation and the need for complete and secure code examples can be closed. Still, the platform needs more code examples.