I liked the part where you lectured on only the essential parts. The lecture time is a little under 2 hours, so it is not that long, but it excludes the parts that are too in-depth and difficult, and only covers the necessary parts of cryptography. I don't think it will be too difficult even for non-majors. The lecture materials you prepared were also very helpful for understanding. The attached materials were effective in helping me understand the lecture, and although the lecture was about a subject that could be difficult, it was easy to understand and fun to listen to.