How Do Cryptographic Tests Work?

In 19 forty six, a researcher named thulis proposed a cipher test in the fifth edition of the text book, an introduction to pari psychology. The passage can be deciphered only by use of a key word or phrase that is known solely by the person who designs the code during their lifetime. So beyond random chance, info could be coming either from psychic sources, if they exist, or from departed human souls. And nobody's figured out a way to distinguish between these two possibilities. Neither have they figured out how todist sh those hypotheses from the idea that the information comes from a third source, demons.