Certified Information Systems Security Professional (CISSP) — Question 431

Which of the following encryption technologies has the ability to function as a stream cipher?

Answer options

• A. Cipher Block Chaining (CBC) with error propagation
• B. Electronic Code Book (ECB)
• C. Cipher Feedback (CFB)
• D. Feistel cipher

Correct answer: C

Explanation

The correct answer is C, Cipher Feedback (CFB), as it is specifically designed to encrypt data in a stream format. The other options, such as CBC and ECB, are block cipher modes that do not function as stream ciphers, while the Feistel cipher is a structure for building block ciphers rather than a mode of operation.