Which attack is used when the attacker wants to detect the hiding technique given both the message and stego-medium?

Which attack is used when the attacker wants to detect the hiding technique given both the message and stego-medium?

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

Answer: (A)

In steganalysis, the amount of information you have about both the hidden payload and the carrier determines how easily you can infer the embedding method. When you have access to both the stego-medium and the actual message that was hidden, you can directly compare the two and observe exactly how the payload was integrated into the cover. This makes it possible to spot patterns, rules, or modifications the author used to conceal the data, revealing the hiding technique itself. That level of insight comes from having the stego-object paired with the known message, which is why this scenario is described as a known-stego attack. If you only had the stego-medium without the original message, you’d be limited to general statistical clues and wouldn’t be able to map those clues to a specific embedding rule as reliably. If you had the message but not the stego, you couldn’t verify how it was placed into the carrier. The other attack models describe different degrees of knowledge or control over the embedding process, but with both the stego-medium and the hidden message available, identifying the technique becomes most direct and definitive.

In steganalysis, the amount of information you have about both the hidden payload and the carrier determines how easily you can infer the embedding method. When you have access to both the stego-medium and the actual message that was hidden, you can directly compare the two and observe exactly how the payload was integrated into the cover. This makes it possible to spot patterns, rules, or modifications the author used to conceal the data, revealing the hiding technique itself. That level of insight comes from having the stego-object paired with the known message, which is why this scenario is described as a known-stego attack.

If you only had the stego-medium without the original message, you’d be limited to general statistical clues and wouldn’t be able to map those clues to a specific embedding rule as reliably. If you had the message but not the stego, you couldn’t verify how it was placed into the carrier. The other attack models describe different degrees of knowledge or control over the embedding process, but with both the stego-medium and the hidden message available, identifying the technique becomes most direct and definitive.