Each sequence of numbers is constructed of a page number, a line number, and a word number in a given text (which is the key). Sometimes, the page number is elided and/or a character number is added. Simple, albeit time-consuming.
35 9 1 / 511 12 1 / 262 1 7
Here the key is The Time Traveler's Wife by Audrey Niffenegger.
What strikes me about book ciphers is the key.
The premise of the book cipher, in my opinion, is that both parties have read the same book. The key represents an overlap in their shared experience, and their ways of thinking. The key is as much a message as the plaintext. It says: we are the same. we share an experience, and so, we share a language.
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