NPTEL Ethical Hacking Assignment 6 Answers (Week 6)
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
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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. Diffie-Hellman key exchange
d. None of these
Answer: c. Diffie-Hellman key exchange
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NPTEL Ethical Hacking Assignment 7 Answers
