Which attack is described as generating stego objects from a known message to identify the embedding algorithm?

Which attack is described as generating stego objects from a known message to identify the embedding algorithm?

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

Answer: (B)

Having access to both a cover object and its stego counterpart lets you see exactly what changes were made to hide the message. This is the essence of a known-cover attack: you compare the original cover with the stego to identify the specific embedding technique used. By aligning the cover and stego and examining which bits or regions were altered, you can reveal patterns, payload placement, and other characteristics of the embedding algorithm. This direct reference makes it possible to infer or reconstruct the method behind the hiding process. Other models rely on knowing the hidden message, being able to choose the message to embed, or only having stego objects, which don’t provide the same concrete basis for identifying the embedding method.

Having access to both a cover object and its stego counterpart lets you see exactly what changes were made to hide the message. This is the essence of a known-cover attack: you compare the original cover with the stego to identify the specific embedding technique used. By aligning the cover and stego and examining which bits or regions were altered, you can reveal patterns, payload placement, and other characteristics of the embedding algorithm. This direct reference makes it possible to infer or reconstruct the method behind the hiding process. Other models rely on knowing the hidden message, being able to choose the message to embed, or only having stego objects, which don’t provide the same concrete basis for identifying the embedding method.