'Dyadic, or binary numbers – old news,' the Doctor said, waving a hand in the air so that the lace cuff flopped around. 'My late friend and colleague Mr. John Wilkins published a cryptographic system based on this more than forty years ago in his great Cryptonomicon :unauthorized Dutch editions of it are still available over yonder in the Booksellers' Quarter should you desire. But what I take away from the Chinese method of fortune-telling is the notion of producing random numbers by the dyadic technique, and by this Wilkins's system could be incomparably strengthened.' All of which was like the baying of hounds to Jack.