GATE CSE 2016 Set 2 | Network Security Question 5 | Computer Networks

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GATE CSE 2016 Set 2

MCQ (Single Correct Answer)

-0.3

Anarkali digitally signs a message and sends it to Salim. Verification of the signature by Salim requires

Anarkali's public key

Salim's public key

Salim's private key

Anarkali's private key

GATE CSE 2015 Set 1

MCQ (Single Correct Answer)

-0.3

Suppose that everyone in a group of N people wants to communicate secretly with the N - 1 others using symmetric key cryptographic system. The communication between any two persons should not be decodable by the others in the group. The number of keys required in the system as a whole to satisfy the confidentiality requirement is

N(N - 1)

$${{N(N - 1)} \over 2}$$

(N - 1)²

GATE CSE 2014 Set 1

MCQ (Single Correct Answer)

-0.3

Which one of the following are used to generate a message digest by the network security protocols?
(P) RSA
(Q) SHA-1
(R) DES
(S) MD5

P and R only

Q and R only

Q and S only

R and S only

GATE CSE 2013

MCQ (Single Correct Answer)

-0.3

Using public key cryptography, X adds a digital signature σ to message M, encrypts, and sends it to Y, where it is decrypted. Which one of the following sequences of keys is used for the operations?

Encryption: X's private key followed by Y's private key;
Decryption: X’s public key followed by Y’s public key

Encryption: X's private key followed by Y's public key;
Decryption: X's public key followed by Y's private key

Encryption: X's public key followed by Y's private key;
Decryption: Y's public key followed by X's private key

Encryption: X's private key followed by Y's public key;
Decryption: Y's private key followed by X's public key

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