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Information Technology and Cyber Security

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Alice uses PGP to send a secure message to Bob. She signs the message with her private key and encrypts it with Bob’s public key. Which of the following is/are true?

Anyone can verify Alice’s identity.

60%✨

Only Alice can read the message

40%

Only Bob can decrypt the message.

100%✨

Bob uses Alice’s public key to decrypt the message.

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Match the following components with their primary purpose:

Component	Purpose
1. PGP	A. X.509 certificates
2. S/MIME	B. Challenge-response login
3. SSH	C. Web security
4. HTTPS	D. Web of trust

1→D, 2→A, 3→B, 4→C

1→A, 2→D, 3→C, 4→B

1→B, 2→D, 3→A, 4→C

1→C, 2→B, 3→D, 4→A

Which

of the following values satisfy the congruence : x ≡ 4 mod 9

In the previous question (Q no. 6, where Alice chooses the values p=13, q=17), If Alice encrypts

the message M=10, what is the ciphertext C?

(Use : C=M^e mod n)

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Alice chooses p=13, q=17. She selects e=5. Which

of the following statements are true?

ed mod ϕ( n ) = 1

n=221, ϕ( n ) = 192

Private key d = 77

gcd( e, ϕ( n ) ) = 1

If a≡7(mod11)

and b≡9(mod11), then which of the

following is/are true?

a+b≡5(mod11)

a+b≡16(mod11)

a−b≡−2(mod11)

b−a≡2(mod11)

Group 1	Group 2
P. Data Link Layer	1. Ensures reliable transport of data over a physical point-to-point link
Q. Network layer	2. Encodes/decodes data for physical transmission
R. Transport Layer	3. Allows end-to-end communication between two processes
	4. Routes data from one network node to the next