GSLC · Question #125
An Active Attack is a type of steganography attack in which the attacker changes the carrier during the communication process. Which of the following techniques is used for smoothing the transition…
The correct answer is B. Blur. In steganography active attacks, the blur technique smooths color transitions at hard edges to conceal carrier modifications. It averages adjacent pixel values to reduce artifacts left by data embedding.
Question
An Active Attack is a type of steganography attack in which the attacker changes the carrier during the communication process. Which of the following techniques is used for smoothing the transition and controlling contrast on the hard edges, where there is significant color transition?
Options
- ASoften
- BBlur
- CSharpen
- DRotate
How the community answered
(31 responses)- A3% (1)
- B84% (26)
- C10% (3)
- D3% (1)
Why each option
In steganography active attacks, the blur technique smooths color transitions at hard edges to conceal carrier modifications. It averages adjacent pixel values to reduce artifacts left by data embedding.
Soften reduces overall image sharpness globally but is not specifically designed to target and smooth contrast at hard color-transition edges.
Blur applies a smoothing filter across pixel neighborhoods, averaging color values to reduce abrupt transitions at hard edges. This controls contrast at boundaries where significant color change occurs, making steganographic alterations blend naturally into the carrier image and reducing detectability.
Sharpen accentuates and increases the contrast of edges rather than reducing it, which would make color transitions more visible and carrier modifications easier to detect.
Rotate changes the spatial orientation of an image and has no effect on pixel-level color transitions or edge contrast.
Concept tested: Blur technique for edge smoothing in steganography
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