(n.) The act or art of writing in secret characters; also, secret characters, or cipher.

cipher code coded message coup de plume criticism cryptanalysis cryptoanalysis cryptoanalytics cryptogram cryptograph cryptographer cryptology diagnostics engrossment epigraphy exegetics hermeneutics ink spilling inkslinging inscription invisible ink lettering lexicography literary criticism macrography metoposcopy micrography oneirology paleography pathognomy pen pen-and-ink pencil driving physiognomics physiognomy scrivenery scrivening secret language secret writing semeiology semeiotics sympathetic ink symptomatology textual criticism tropology typewriting typing writing