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MIT Mystery Hunt Puzzle Index: Keyword Data

book code

A type of cipher where a book or other widely available text is used as a key, and the message is encoded as a series of numbers which are indexes into the text. Indexes may be single (word or letter counts in the entire text) or multiple (indexing first by page, then by word, or first by word, then by letter, etc.) This is sometimes called a Beale cipher, in reference to a famous one which used the U.S. Declaration of Independence as a key.


MIT Mystery Hunt 1996 Endgame
MIT Mystery Hunt 1998 19.567 Thesis Preparation
MIT Mystery Hunt 2012 1207 1370
MIT Mystery Hunt 2020 The Wizard's Escape
MIT Mystery Hunt 2022 On Second Thought