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Question 9Asked in UGC NET Computer Science, December 2014 (Paper II & III, Selected Questions)

How many distinct stages are there in DES algorithm, which is parameterized by a 56-bit key?

  1. A16
  2. B17
  3. C18
  4. D19
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Correct answer: (D) 19

Explanation

The DES algorithm works with a 64-bit block size, employs 16 processing rounds, and is driven by a 56-bit key (with 8 additional parity bits), making up a total of 19 distinct stages.

From UGC NET Computer Science PYQ, December 2014 (Paper II & III, Selected Questions)

This is question 9 of UGC NET Computer Science PYQ, December 2014 (Paper II & III, Selected Questions). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.