Which technique substitutes insignificant bits to embed secret data?

Which technique substitutes insignificant bits to embed secret data?

• A. Substitution Techniques
• B. Distortion Techniques
• C. Computer-Based Methods
• D. Cover Generation Techniques

Answer: (A)

The idea being tested is embedding data by replacing the least significant bits of the cover data. These bits are the smallest components of each unit (like a pixel color value or an audio sample) and have minimal impact on the overall appearance or sound when altered. By substituting these insignificant bits with bits from the secret message, you can hide information with little perceptible change, which is the hallmark of this approach. This method is widely used in steganography because it preserves the host’s quality while still allowing reliable retrieval of the hidden data. Distortion techniques, on the other hand, change the cover in ways that can introduce noticeable artifacts or alter its statistical properties. Cover generation techniques create a new cover directly from the hidden data rather than hiding it inside an existing one. The term computer-based methods is too broad and doesn’t specify the bit-level substitution concept used to embed data.

The idea being tested is embedding data by replacing the least significant bits of the cover data. These bits are the smallest components of each unit (like a pixel color value or an audio sample) and have minimal impact on the overall appearance or sound when altered. By substituting these insignificant bits with bits from the secret message, you can hide information with little perceptible change, which is the hallmark of this approach. This method is widely used in steganography because it preserves the host’s quality while still allowing reliable retrieval of the hidden data.

Distortion techniques, on the other hand, change the cover in ways that can introduce noticeable artifacts or alter its statistical properties. Cover generation techniques create a new cover directly from the hidden data rather than hiding it inside an existing one. The term computer-based methods is too broad and doesn’t specify the bit-level substitution concept used to embed data.