Exam CISSP-ISSAP topic 1 question 7 discussion

The question specifically asked about a method for transforming a message into a masked form, together with a way of undoing the transformation to recover the message. While steganography is a method of hiding information within other non-secret data (such as embedding information in an image or audio file), it typically does not involve a reversible transformation like a cipher. Steganography focuses on concealing the existence of information rather than encrypting it. The goal is to hide the fact that there is a secret message, not necessarily to make the message itself unintelligible without the proper key or method. On the other hand, ciphers, as mentioned earlier, involve reversible transformations. They take plaintext, apply an encryption algorithm, and produce ciphertext, and this process can be reversed with the appropriate key or algorithm to recover the original plaintext. That's why the correct answer to the question is A. Cipher.

A. Cipher A cipher is a method for transforming a message into a masked form, and it also includes a way to reverse or undo the transformation to recover the original message.

C. Steganography is a method for transforming a message into a masked form and also includes a way of undoing the transformation to recover the message. Steganography involves hiding information within other innocuous data or media (such as images, audio files, or video) in order to conceal its existence.

C. Steganography