The ciphered autobiography of a 19^th century egyptologist

Simeone Levi was an Italian Egyptologist who lived in Turin during the second half of the 19th century. His major work is an eight volume hieroglyphic dictionary. He left a ciphered autobiography which remained a mistery for about three generations in his family. We present here the procedure used to decipher the text and the structure of the code invented by Simeone Levi.