16 Nov Practice Test Question – Block and Stream Ciphers
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Which one of the following statements about block and stream ciphers is correct?
A. Stream ciphers commonly use Feistel networks.
B. Block ciphers are faster than equivalent stream ciphers.
C. Most modern ciphers are block ciphers.
D. Block ciphers encrypt one byte at a time.
Correct Answer: C
It is true that block ciphers make up the vast majority of modern encryption algorithms. Stream ciphers are faster, not slower, than block ciphers. Block ciphers may make use of Feistel networks, while stream ciphers cannot. Block ciphers work on chunks of data, rather than a single byte at a time.
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