Noun secret writing has 2 senses
  1. cryptogram, cryptograph, secret writing - a piece of writing in code or cipher
    --1 is a kind of writing, written material, piece of writing
  2. cryptography, coding, secret writing - act of writing in code or cipher
    --2 is a kind of writing, committal to writing
    --2 has particulars:
     encoding, encryption; recoding; decoding, decryption, decipherment
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