Exam 312-49v10 topic 1 question 365 discussion

Answer: A. The hidden message and the corresponding stego-image are known Explanation: A. The hidden message and the corresponding stego-image are known: Correct – Known-stego attack requires both the stego-image and the hidden message. B. During the communication process, active attackers can change cover: Incorrect – Describes active attacks, not known-stego. C. Original and stego-object are available and the steganography algorithm is known: Incorrect – Describes a chosen-stego attack. D. Only the steganography medium is available for analysis: Incorrect – Describes a blind or stego-only attack.

The correct answer is A. The hidden message and the corresponding stego-image are known. In Steganalysis, a Known-stego attack is a scenario where the analyst has access to both the hidden message (the secret information) and the corresponding stego-image (the image with the hidden message). This allows the analyst to compare the two and potentially identify the steganography method used. Here's a brief overview of the other options: B. This describes an Active attack, where the attacker can modify the cover object (e.g., image) during communication. C. This describes a Known-cover attack, where the original cover object and the stego-object are available, and the steganography algorithm is known. D. This describes a Blind attack, where only the steganography medium (e.g., image) is available for analysis, without any knowledge of the hidden message or cover object.

The attacker knows the steganography algorithm as well as original and stego-object.

Known-stego Attack In this attack, the attacker knows the steganography algorithm as well as original and stego-object. Therefore, the attacker can extract the hidden information using the information at hand.