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The following are methods of steganography: i) Digital Watermarking, and/or ii) Concealment Cipher.
Both i) and ii) are Correct
Both i) and ii) are Incorrect
Only i) is Correct
Only ii) is Correct
A concealment cipher (or null cipher), is an ancient form of encryption where the plaintext is mixed with a large amount of non-cipher material. Today it is regarded as a simple form of steganography, which can be used to hide ciphertext.
https://en.wikipedia.org/wiki/Null_cipher
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