Steganography involves which technique?

• A. Encrypting data with a secret key
• B. Replacing sensitive data with tokens
• C. Hiding data within another medium
• D. Rotating encryption keys regularly

Answer: (C)

Steganography hides data within another medium, so the presence of the message is concealed rather than made unreadable. This means you can embed a secret payload inside something like an image, audio, or video file in a way that casual observers don’t notice anything unusual about the file. A classic example is altering the least significant bits of image pixels to carry a hidden message, while the image still looks essentially the same to the eye.

This is why the option describing hiding data within another medium is the best match. The other ideas involve different security concepts: encrypting data with a secret key protects content but does not hide that a message exists; replacing sensitive data with tokens is tokenization, which masks actual data but isn’t about concealing the existence of a hidden payload; rotating encryption keys regularly is about key management, not hiding data within a carrier file.