Computer Hacking Forensic Investigator (CHFI v10) — Question 251

In Steganalysis, which of the following describes a Known-stego attack?

Answer options

• A. The hidden message and the corresponding stego-image are known
• B. During the communication process, active attackers can change cover
• C. Original and stego-object are available and the steganography algorithm is known
• D. Only the steganography medium is available for analysis

Correct answer: C

Explanation

The correct answer is C because a Known-stego attack involves having access to both the original and the altered object, as well as knowledge of the algorithm used, which allows for effective analysis. Options A, B, and D do not provide sufficient information or context for a Known-stego attack, as they lack the necessary elements of both the original and stego objects or the algorithm itself.