A bit back in the book, but #Heinlein once more show that he has no idea about #criptografy.
Especially, like most authors, he has never heard of Kerckhoffs’ principle

The protagonist gets a message with “five-letter code groups, about fifty of them”. And “‘If they can identify the code, it is then just a matter of paying a fee, licit or illicit, to translate it.’”

https://en.wikipedia.org/wiki/Kerckhoffs%27s_principle

#cryptography #KerckhoffsPrinciple
#OspalhReads #worldasmyth #CatThruWalls