This set of MCQ(multiple choice questions) focuses on the **Ethical Hacking week 6 Solutions**.

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### Ethical Hacking week 6 Solutions

**Q1.** Which of the following is not an example of active security attack?

a) Masquerade

b) Replay

c) Traffic analysis

d) Modification

e) Denial of Service

**Answer:** c) Traffic analysis

**Q2.** Consider the following statements:

(i) In symmetric key cryptography, single shared key is used by sender and receiver.

(ii) In Asymmetric key cryptography, separate keys are used by sender and receiver.

a) Only (i) is true

b) Only (ii) is true

c) Both (i) and (ii) are true

d) Both (i) and (ii) are false

**Answer:** c) Both (i) and (ii) are true

**Q3.** 15 parties want to exchange messages securely using a symmetric key encryption algorithm. The number of distinct key values required will be ___________.

**Answer:** 105

**Q4.** Consider a mono-alphabetic cipher with the following key value:

(A B C D I J K L E F G H M N O P U V W X Q R S T Y Z)

What will be the encrypted form of the message “W I N D O W”?

a) W E N D H W

b) S K N G H S

c) S E N D O S

d) None of these

**Answer:** c) S E N D O S

**Q5.** How many AES rounds are required for 192-bit key size?

a) 10

b) 11

c) 12

d) 14

**Answer:** c) 12

**Q6.** What is the key length in data encryption standard (DES)?

a) 56

b) 64

c) 128

d) 192

**Answer:** a) 56

**Q7.** 100 parties want to exchange messages securely using some public key encryption technique like RSA. The number of distinct key values required will be __________.

**Answer:** 200

**Q8.** In Digital signature sender signs a message with its:

a) Private key

b) Public key

**Answer:** a) Private key

**Q9.** On which difficult mathematical problem does the security of RSA algorithm depend on?

a) Discrete logarithm problem

b) Testing whether a given number if prime or not

c) Prime factorization problem

d) The RSA threshold detection

e) All of these

**Answer:** c) Prime factorization problem

**Q10.** Which of the following statement(s) is/are true for Diffie-Hellman Key Exchange algorithm?

a) It allows group of users to agree on secret key over insecure channel.

b) The security of the algorithm depends on prime factorization problem.

c) The algorithm is vulnerable to man-in-the-middle attack.

d) It does not require any prior communication between sender and receiver.

e) All of these.

**Answer:** a), c), d)

**Ethical Hacking** NPTEL Week 6 Solutions

**Ethical Hacking**

**Q1.** 15 parties want to exchange messages securely using a symmetric key encryption algorithm. The number of distinct key values required will be:

a) 30

b) 225

c) 210

d) 105

**Answer:** d) 105

**Q2.** 200 parties want to exchange messages securely using some public key encryption technique like RSA. The number of distinct key values required will be __________

**Answer:** 400

**Q3.** What are the effective key lengths used in DES and triple-DES symmetric key encryption algorithms in bits?

a) 56 and 168

b) 56 and 112

c) 56 and 56

d) 64 and 128

e) None of these

**Answer:** a) 56 and 168

**Q4.** On which difficult mathematical problem does the security of RSA algorithm depend on?

a) Discrete logarithm problem.

b) Testing whether a given number if prime or not.

c) Prime factorization problem.

d) The RSA threshold detection.

e) All of these

**Answer:** c) Prime factorization problem.

**Q5.** Which of the following types of attack can the DoS attack be categorized into?

a) Interruption

b) Interception

c) Modification

d) Fabrication

**Answer:** a) Interruption

**Q6.** Which of the following terms concern verifying the identity of the sender?

a) Encryption.

b) Authentication.

c) Decryption.

d) None of these.

**Answer:** b) Authentication.

**Q7.** Consider a mono-alphabetic cipher with the following key value:

(A B C D I J K L E F G H M N O P U V W X Q R S T Y Z)

What will be the encrypted form of the message “W I N D O W” ?

a) W E N D H W

b) S K N G H S

c) S E N D O S

d) None of these.

**Answer:** c) S E N D O S

**Q8.** How many AES rounds are required for 128-bit key size?

a) 10

b) 11

c) 12

d)14

**Answer:** a) 10

**Q9.** For encryption using public-key cryptography, we use the

a) Receiver’s public key

b) Receiver’s private key

c) Sender’s public key

d) Sender’s private key

**Answer:** a) Receiver’s public key

**Q10.** Which of the following techniques is/are vulnerable to man-in-the-middle attack?

a) AES

b) RSA

c) Diffle-Hellman key exchange

d) None of these

**Answer:** c) Diffle-Hellman key exchange

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