A network stream needs to be encrypted. Sara, the network administrator, has selected a cipher which will encrypt 8 bits at a time before sending the data across the network. Which of the following…

The correct answer is A. Block cipher. A block cipher encrypts data in fixed-size chunks (blocks) - common block sizes are 64 bits or 128 bits, but 8 bits is a valid block size. A stream cipher (B) encrypts data one bit or one byte at a time continuously, synchronized with the data stream. CRC (C) is a cyclic…

General security concepts

Question

A network stream needs to be encrypted. Sara, the network administrator, has selected a cipher which will encrypt 8 bits at a time before sending the data across the network. Which of the following has Sara selected?

Options

ABlock cipher
BStream cipher
CCRC
DHashing algorithm

How the community answered

(23 responses)

A
96% (22)
C
4% (1)

Explanation

A block cipher encrypts data in fixed-size chunks (blocks) - common block sizes are 64 bits or 128 bits, but 8 bits is a valid block size. A stream cipher (B) encrypts data one bit or one byte at a time continuously, synchronized with the data stream. CRC (C) is a cyclic redundancy check used for error detection, not encryption. A hashing algorithm (D) is a one-way function, not an encryption cipher. Encrypting a fixed number of bits at a time defines block cipher operation.

Topics

#block cipher#stream cipher#encryption modes#cryptography

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