Victor works as a professional Ethical Hacker for SecureEnet Inc. He has been assigned a job to test an image, in which some secret information is hidden, using Steganography. Victor performs the…

A Steg-Only Attack means the analyst only has access to the stego-object and attempts passive detection without modifying or manipulating the image.

Stegdetect is a specific software tool used to detect steganography in JPEG images, not a category of image manipulation-based attack.

Active Attacks in steganography involve applying transformations such as smoothening, contrast reduction, noise filtering, sharpening, rotating, and resampling to a stego-image with the goal of destroying embedded hidden data or making it detectable - every technique Victor uses (pixel averaging, resampling, softening, sharpening) is characteristic of this attack category targeting the carrier medium itself.

A Chosen-Stego Attack involves the attacker selecting the stego-object and possessing knowledge of the embedding algorithm, which is unrelated to actively transforming the image.