I think the section about the difficult physical work involved in the code-breaking process was the one I liked best, too. I mean, reading about being recruited for one's interest in cryptic crosswords or chess puzzles is all well and good, but the sheer amount of literal paper-pushing involved in the process simply can't be overlooked and yet tends to be glossed over in some of the broader histories of cryptography.

Glad it proved to be worth reading, in spite of the logarithms. ^_^