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

Question

Options

• ACipher Feedback (CFB)
• BFeistel cipher
• CCipher Block Chaining (CBC) with error propagation
• DElectronic Code Book (ECB)

• A
  86% (37)
• B
  7% (3)
• C
  5% (2)
• D
  2% (1)

Explanation

Cipher Feedback (CFB) is an encryption technology that has the ability to function as a stream cipher. A stream cipher is a type of symmetric encryption that encrypts or decrypts one bit or byte of plaintext or ciphertext at a time, using a keystream that is derived from a secret key and an initialization vector. CFB is a mode of operation that converts a block cipher, such as AES or DES, into a stream cipher, by feeding the output of the block cipher back into its input, and XORing it with the plaintext or ciphertext. CFB can provide the advantages of both block ciphers and stream ciphers, such as high security, low error propagation, and high efficiency. Feistel cipher, Cipher Block Chaining (CBC) with error propagation, and Electronic Code Book (ECB) are not encryption technologies that have the ability to function as stream ciphers. These are types of block ciphers or modes of operation that encrypt or decrypt a fixed-length block of plaintext or ciphertext at a time, using a secret key and a chaining mechanism. Block ciphers are different from stream ciphers in terms of their design, operation, and performance.

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