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
steganography
science
scientific discipline
crypt
cepstrum
cmt
communityone
cryptographic
cryptosystem
decryption
encryption
modulo