I know what you mean about the old books about Nostradamus's quatrains being hard to read and next to impossible to understand. I have a few old books. Mr. Ramotti discovered that while the text was written in French, Nostradamus inserted clues in Italian. He first writes the quatrains in English, French and Italian Then interprets it in Key Code. Then explains what it means himself. I tried to find in the book if it tells about the code but I can't find it, other than the Italian words being mentioned.
Nostradamus, somewhere in his writing, said that the man that would find the code would have the same name as his son...Cesare...and that's the middle name of the author.