CISSP – Information Systems Security Architecture Professional (ISSAP) — Question 73

Which of the following is a method for transforming a message into a masked form, together with a way of undoing the transformation to recover the message?

Answer options

• A. Cipher
• B. CrypTool
• C. Steganography
• D. MIME

Correct answer: A

Explanation

The correct answer is A, as a cipher is specifically designed to encrypt and decrypt messages, allowing for the original message to be recovered. Options B and D are tools and protocols related to cryptography but do not perform the transformation themselves. Option C, steganography, involves hiding a message within another medium rather than transforming it.