This society of cabbalist, had various methods of secret writing.
cabbalist′ic, -al, relating to the cabbala: having a hidden meaning.
1520s, from Medieval Latin cabbala, from Mishnaic Hebrew qabbalah "reception, received lore, tradition," especially "tradition of mystical interpretation of the Old Testament," from qibbel "to receive, admit, accept." Cf. Arabic qabala "he received, accepted."