[1] : WordNet (r) 2.0

secret writing
     n 1: a piece of writing in code or cipher syn: cryptogram, cryptograph
     2: act of writing in code or cipher syn: cryptography, coding
see also:
cryptogram cryptograph cryptography coding 

Writing >> W Words
Writing, definition of term: Writing
writing_pag1.html

Secret >> S Words
Secret, definition of term: Secret
secret_pag1.html

Secret Service >> S Words
Secret Service, definition of term: Secret Service
secret+service_pag1.html

Secret Police >> S Words
Secret Police, definition of term: Secret Police
secret+police_pag1.html

Picture Writing >> P Words
Picture Writing, definition of term: Picture Writing
picture+writing_pag1.html

Trade Secret >> T Words
Trade Secret, definition of term: Trade Secret
trade+secret_pag1.html