These are Cyber Security and Privacy Nptel Week 8 Assignment 8 Answers
Q1. Which of the following terms describes the process of making and using codes to secure the transmission of information? Algorithm Cryptography Steganography Cryptanalysis
Answer: Cryptography
Q2. What is term is used to describe a cryptographic method that incorporates mathematical operations involving both a public key and a private key to encipher or decipher a message? Private-key encryption Symmetric encryption Advanced Encryption Standard (AES) Asymmetric encryption
Answer: Asymmetric encryption
These are Cyber Security and Privacy Nptel Week 8 Assignment 8 Answers
Q3. A substitution cipher that incorporates two or more alphabets in the encryption process is called——————- Monoalphabetic substitution Block cipher substitution Stream cipher substitution Polyalphabetic substitution
Answer: Polyalphabetic substitution
Q4. The current standard for the encryption of data, as specified by NIST ——— is based on the Rijndael algorithm, which was developed by Vincent Rijmen and Joan Daemen. DES RSA AES Message Digest
Answer: AES
These are Cyber Security and Privacy Nptel Week 8 Assignment 8 Answers
Q5. True or False: Nonrepudiation means that customers or partners can be held accountable for transactions, such as online purchases, which they cannot later deny. True False
Answer: True
Q6. Limited-use symmetric keys for temporary communications during an online session is called Session keys One-time padding AES DES
Answer: Session keys
These are Cyber Security and Privacy Nptel Week 8 Assignment 8 Answers
Q7. Match the following Choose the correct answer A-3, B-5, C-4, D-1, E-2 A-2, B-1, C-4, D-5, E-3 A-4, B-2, C-3, D-1, E-1 A-5, B-2, C-3, D-1, E-4
Answer: A-2, B-1, C-4, D-5, E-3
These are Cyber Security and Privacy Nptel Week 8 Assignment 8 Answers
Q8. Suppose that everyone in a group of N people wants to communicate secretly with the N-1 others using a symmetric key cryptographic system. Communication between any two persons should not be decodable by others in the group. The number of keys required in the system as a whole to satisfy the confidentiality requirement is 2N N(N-1) N(N-1)/2 (N-1)2
Answer: N(N-1)/2
Q9. Decrypt the following message if it was encrypted using a shift cipher with a shift of 3. Message: NPTELINFORMATION Q S W H O L Q I R U P W L R Q Q S W H O L Q I T U P W L R Q Q S W F O L Q I R V P W L R Q Q S W H O L Q I R V P W L R Q
Answer: Q S W H O L Q I R U P W L R Q
These are Cyber Security and Privacy Nptel Week 8 Assignment 8 Answers
Q10. ————security protocols are used to protect e-mail SMTP HTTPS S/MIME, PEM, and PGP Telnet
Answer: S/MIME, PEM, and PGP
Q11. What is the most popular encryption system used over the Web? Diffie Hellman key exchange RSA Block cipher DES
Answer: RSA
These are Cyber Security and Privacy Nptel Week 8 Assignment 8 Answers
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