I'm trying to write a book version of my talk, Crypto 101. The "tour guide versus handbook" problem is one I definitely have a hard time staying on the good sid

I'm trying to write a book version of my talk, Crypto 101. The "tour guide versus handbook" problem is one I definitely have a hard time staying on the good side of :) Like the talk, the book will keep the structure of taking primitive X_i, showing why we don't just use a system based entirely on X_i, and instead also need X_{i+1}, and how eventually \sum X_i (perhaps excluding a couple) leads to complete cryptosystems, for some value of \sum (obviously, you can't just throw stuff together and expect it to work). This blog post was great motivation for me. I will keep the aforementioned structure, but now I'm extra motivated to also add actual exercises instead of just showing it's broken :) Thank you. PS: I understand you're really busy, but there are few people I'd rather have as a reviewer.