The GATE Grind

GATE 2014 CS (CS1) – Question 34

Computer Networks · Data Link Layer: Error Detection, Medium Access Control, Flow Control · 1 mark · Multiple choice

Which generate message digests for network-security protocols? P: RSA; Q: SHA-1; R: DES; S: MD5.

  1. P and R only
  2. Q and R only
  3. Q and S only
  4. R and S only

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Correct answer: (C) Q and S only

Explanation

SHA-1 and MD5 are hash algorithms producing message digests. RSA is an asymmetric cryptographic scheme and DES is a block cipher. Thus **Q and S only, C**. This classifies the historical algorithms; it does not recommend them for present-day security use.