Exam 312-49v10 topic 1 question 743 discussion

Answer: C Explanation: Knowing the (1) algorithm, as well as having access to (2a) the original, and (2b) the stego-object allows the most precise analysis. (A) ❌ Relies on statistical anomalies; less effective if attacker knows detection methods (B) ❌ Depends on having the exact hidden message, which is rare in real-world scenarios (C) ✅ Provides complete context—algorithm, original, and altered file—for accurate detection (D) ❌ Focuses on message-to-object relation, not ideal when evading known detection techniques - If you agree: UPVOTE this post to add your vote to the community tally. If you disagree: discuss with citations Both actions crowdsource best answers.

Given that the analysts do not know which specific steganography algorithm the attacker will use, the most effective method would likely be: **A. Chi-square attack, where the analyst performs probability analysis to test whether the stego object and original data are identical** The Chi-square attack is a statistical method that does not rely on prior knowledge of the specific steganography algorithm used. Instead, it analyzes the distribution of pixel values or other properties in the image to detect anomalies that may indicate the presence of hidden data. This approach is effective because it can be applied to a wide range of steganographic techniques without needing specific knowledge about the algorithm the attacker used.

An organization is concerned about potential attacks using steganography to hide malicious data within image files. After a recent breach, the incident response team found that an attacker had managed to sneak past their defenses by hiding a keylogger inside a legitimate image. Given that the attacker has knowledge of the organization’s steganography detection techniques, which method of steganalysis would likely be the most effective in detecting such a steganographic attack in the future? A. Chi-square attack, where the analyst performs probability analysis to test whether the stego object and original data are identical B. Known-message attack, where the analyst has a known hidden message in the corresponding stego-image and looks for patterns that arise from hiding the message C. Known-stego attack, where the analyst knows both the steganography algorithm and original and stego-object D. Chosen-message attack, where the analyst uses a known message to generate a stego-object in order to find the steganography algorithm used

In a chosen-message attack, the attacker creates steganography media using the known-message and steganography tool (or algorithm).