In steganography, which statement best describes a channel?

In steganography, which statement best describes a channel?

• A. The payload message itself
• B. The type of medium used to hide data (passive or active)
• C. The encryption key
• D. The file header

Answer: (B)

In steganography, a channel is the medium or path that carries the hidden content—the carrier used to conceal information, such as an image, audio, or video, and how that carrier is used to embed data (e.g., covertly within its structure). Because the channel describes the type of medium and the manner of its use to hide data, this option correctly identifies the channel as the medium used to conceal the payload. Think of the payload as the secret message itself, which is what’s hidden inside the carrier. The encryption key is about protecting the hidden data, not describing the conduit. A file header is metadata about the file, not the mechanism used to conceal the message.

In steganography, a channel is the medium or path that carries the hidden content—the carrier used to conceal information, such as an image, audio, or video, and how that carrier is used to embed data (e.g., covertly within its structure). Because the channel describes the type of medium and the manner of its use to hide data, this option correctly identifies the channel as the medium used to conceal the payload.

Think of the payload as the secret message itself, which is what’s hidden inside the carrier. The encryption key is about protecting the hidden data, not describing the conduit. A file header is metadata about the file, not the mechanism used to conceal the message.