GATE 2019 - Computer Network Quiz-11 (Network Securites ) (App update required to attempt this test) for GATE & PSU CS Exams

Question 1

Alice and Bob want to send the data to each other securely. They want to use the shared key to do that. They use the Diffie-Hellman algorithm to generate the shared key. In Diffie-Hellman if p = 23 and g = 5, and Alice chooses the secret number a = 4, and Bob chooses the secret number b =3 What is the secret key that is generated ________?

Question 2

The minimum positive integer p such that 2^p modulo 11 = 1 is

Question 3

Consider a case where you are implementing RSA algo for the purpose of data security in such away such that the value of P happens to be 7 and the value of Q happens to be 11, then the find legal value of encryption key ?

Question 4

Consider a case where you are implementing RSA algo for the purpose of data security in such away such that the value of P happens to be 7 and the value of Q happens to be 11, then the find decryption key if the legal value of encryption key happens to be 13 ?

Question 5

Consider the following plaintext
GOOD MORNING
Suppose this text is transposition encrypted with key

Then the ciphertext would be

Question 6

A sender S sends a message $m$ to receiver R, which is digitally signed by S with its private key. In this scenario, one or more of the following security violations can take place.

(I) S can launch a birthday attack to replace $m$ with a fraudulent message.

(II) A third party attacker can launch a birthday attack to replace $m$ with a fraudulent message.

(III) R can launch a birthday attack to replace $m$ with a fraudulent message.

Which of the following are possible security violations?