secret writing

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. act of writing in code or cipher
• Syn:
cryptography, coding, steganography
• Derivationally related forms:
code (for: coding), cryptographical (for: cryptography), cryptographer (for: cryptography)
• Hypernyms:
writing, committal to writing
• Hyponyms:
encoding, encryption, recoding, decoding, decryption, decipherment
2. a piece of writing in code or cipher
• Syn:
cryptogram, cryptograph
• Hypernyms:
writing, written material, piece of writing