Hi! Thanks for your comments. I feel that a more detailed reading would most likely address your concerns. The book explicitly addresses why modes of operation

Hi! Thanks for your comments. I feel that a more detailed reading would most likely address your concerns. The book explicitly addresses why modes of operation (and their related bits, like padding) are in the stream cipher section. I've flip-flopped between putting them in one or the other a few times now, but I'm increasingly convinced that doing it this way (and having the book explicitly say that I'm doing it this way) makes the storyline, similar to the one I tried to keep in the talk, work better. The password storage section talks about a lot of broken password stores, as a subsection of the chapter on hash functions. It explicitly refers to the key derivation function section at the end. This pattern comes back through the entire book: "we want to do X, and it may look like we can do X already with the tools P and Q we have already, but you actually still need R and S; here's why".