I think you don't understand what I'm talking about. Finding the crib means you find human error or guess the contents of the text. That's not necessarily something a cryptologist or computer scientist is best equipped for. In the case of the engima that required some information from captured Germans, knowledge about military terms, German, weather, greetings and reading through many, many messages to find reoccurring words or phrases. Now imagine what you need to guess for some surreal biology book.
Also are you seriously suggesting I don't know who Alan Turing is and what they did when my post clearly explains it to that user? Skimming hard?
