1. (noun) act of writing in code or cipher

• cryptography
• secret writing
• steganography

1. (noun) act of writing in code or cipher

• committal to writing
• writing

1. (noun) act of writing in code or cipher

• decipherment
• decoding
• decryption
• encoding
• encryption
• recoding

1. (noun) act of writing in code or cipher

• cipher
• code
• cypher
• encipher
• encrypt
• inscribe
• write in code
• cryptanalyst
• cryptographer
• cryptologist
• cryptanalytic
• cryptographic
• cryptographical
• cryptologic
• cryptological