Question

Which of the following slows the cryptographic algorithm – 1) Increase in Number of rounds 2) Decrease in Block size 3) Decrease in Key Size 4) Increase in Sub key Generationa)

(a) 1 and 3

(b) 2 and 3

(c) 3 and 4

(d) 2 and 4

This question was posed to me in semester exam.

This is a very interesting question from Overview topic in section Cryptography Overview, TCP/IP and Communication Networks of Cryptograph & Network Security

Answer 1

Correct choice is (b) 2 and 3

To explain I would say: Increase in any of the above 4 leads to slowing of the cipher algorithm i.e. more computational time will be required.