Which of the following is NOT a type of steganography?

The concept of steganography involves hiding information within other non-secret data in order to avoid detection. Each method serves a different purpose in the realm of information security.

Watermarking is a form of steganography used to embed information into a digital medium, such as images or audio, to signify ownership or copyright. This technique often involves altering the medium in a way that is imperceptible to the casual observer while communicating key information.

Cryptography, on the other hand, is the practice of encoding information so that only those with the appropriate key can access the original content. While cryptography protects data confidentiality, it does not hide the existence of the information itself, which distinguishes it from steganography.

Digital signatures are used to verify the authenticity and integrity of a message or document. This technique involves creating a unique digital code that corresponds to a set of data, allowing the recipient to confirm the sender's identity and that the content hasn't been altered. While digital signatures involve creating a unique identifier for data, they do not obscure the data itself or hide it within another medium.

In contrast to the other options, steganography specifically focuses on concealing information, which sets it apart as a distinct category from watermarking, cryptography, and digital