NPTEL Ethical Hacking Assignment 6 Answers (Week 6)
Q1. Which of the following statement is true for Masquerade attack?
Answer: d. In this attack, the attacker pretends as a legitimate entity.
1230+ students getting help from instant notifications, Join us on telegram.
Q2. Which of the following statement(s) is/are true?
Answer: b. In private key encryption, a single key is used by sender and receiver.
c. In public key encryption, separate keys are used by sender and receiver.
Q3. Consider the following statement:
(i) In symmetric key cryptography, the security depends on secrecy of the key.
(ii) In symmetric key cryptography, the security depends on encryption/decryption algorithm.
Answer: a. Only (i) is true
Q4. 25 parties want to exchange messages securely. The number of distinct key required by a symmetric key encryption algorithm and public key encryption technique like RSA will be _ and _ respectively.
Answer: e. 300 and 50
Q5. How will be the plaintext for the cipher text “LETTY CEIV” encrypted using a substitution cipher approach, where each letter is replaced by the k-th next letter. (Assumption: (i) the alphabets are wrapped around, i.e. Z is followed by A, (ii) each alphabets (A to Z) is assigned a number (1
to 26), (iii) the value of secrete key k is 4).
Answer: b. HAPPU YAER
Q6. In data encryption standard (DES), longer plain text are processed in _ bit blocks.
Answer: 64
Q7. The effective key lengths used in AES encryption algorithms can be:
Answer: b. 128 bit
c. 192 bit
d. 256 bit
Q8. For decryption using public-key cryptography __ is used.
Answer: b. Receiver’s private key]
Q9. Which of the following statement(s) is/are true.
a. The security of RSA algorithm is dependent on prime factorization problem.
b. RSA algorithm is vulnerable to man-in-the middle attack.
c. Diffie-Hellman approach can be used for encryption/decryption of message.
d. Symmetric encryption approaches are faster than asymmetric encryption.
e. None of these.
Answer: Option A & D.
Q10. Which of the following techniques cannot be used for message authentication?
Answer: d. SHA-O
Disclaimer: These answers are provided only for the purpose to help students to take references. This website does not claim any surety of 100% correct answers. So, this website urges you to complete your assignment yourself.
Also Available:
