This attack generates stego objects from a known message using specific steganography tools in order to identify the steganography algorithms.

This attack generates stego objects from a known message using specific steganography tools in order to identify the steganography algorithms.

• A. Known-message Attack
• B. Known-stego Attack
• C. Chosen-message Attack
• D. Known-cover Attack

Answer: (D)

The situation tests the ability to perform a chosen-message attack. In steganography, this means the attacker can select specific messages to embed and then produce stego objects to observe how the embedding is done. By generating stego with known inputs, you can compare the results from different tools or methods to identify which embedding algorithm or technique was used. The key idea is controlling the input message to elicit outputs that reveal the underlying method. This doesn’t fit a known-cover scenario, which would require having the original cover object to compare against the stego. Nor does it fit known-message or known-stego in this context—the emphasis is on choosing the message to embed (and observing the resulting stego) rather than analyzing a stego with an already known embedded plaintext or analyzing an existing stego without controlling the input.

The situation tests the ability to perform a chosen-message attack. In steganography, this means the attacker can select specific messages to embed and then produce stego objects to observe how the embedding is done. By generating stego with known inputs, you can compare the results from different tools or methods to identify which embedding algorithm or technique was used. The key idea is controlling the input message to elicit outputs that reveal the underlying method.

This doesn’t fit a known-cover scenario, which would require having the original cover object to compare against the stego. Nor does it fit known-message or known-stego in this context—the emphasis is on choosing the message to embed (and observing the resulting stego) rather than analyzing a stego with an already known embedded plaintext or analyzing an existing stego without controlling the input.