Cyber security and privacy | NPTEL | Week 8 Answers

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Cyber Security and Privacy NPTEL Week 8 Answers

Q1. Which of the following terms describes the process of making and using codes to secure the transmission of information?

a) Algorithm
b) Cryptography
c) Steganography
d) Cryptanalysis

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Cyber Security and Privacy NPTEL Week 8 Answers

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 enchipher or decipher a message?

a) Private-key encryption
b) Symmetric encryption
c) Advanced Encryption Standard (AES)
d) Asymmetric encryption

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Q3. A sunstitution cipher that incorporates two or more alphabets in the encryption process is called _____________.

a) Monoalphabetic substitution
b) Block cipher substitution
c) Stream cipher substitution
d) Polyalphabetic substitution

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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.

a) DES
b) RSA
c) AES
d) Message Digest

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Cyber Security and Privacy NPTEL Week 8 Answers

Q5. True or False:
Nonrepudiation means that customers or partners can be held accountable for transaction, such as online purchase, which they cannot later deny.

a) True
b) False

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Q6. Limited-use symmetric keys for temporary communications during an online session is called

a) Session keys
b) One-time padding
c) AES
d) DES

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Q7. Match the following:

a) A-3, B-5, C-4, D-1, E-2
b) A-2, B-1, C-4, D-5, E-3
c) A-4, B-2, C-3, D-1, E-1
d) A-5, B-2, C-3, D-1, E-4

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Cyber Security and Privacy NPTEL Week 8 Answers

Q8. Suppose that everyone in a group of N people wants to communicate secretly with the N-1 others using a symmteric 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

a) 2N
b) N(N-1)
c) N(N-1)/2
d) (N-1)/2

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Q9. Decrypt the following message if it was encrypted using a shift cipher with a shift of 3.
Message: NPTELINFORMATION

a) Q S W H O L Q I R U P W L R Q
b) Q S W H O L Q I T U P W L R Q
c) Q S W F O L Q I R V P W L R Q
d) Q S W H O L Q I R V P W L R Q

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Q10. _____________ security protocols are used to protect e-mail

a) SMTP
b) HTTPS
c) S/MIME, PEM, and PGP
d) Telnet

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Cyber Security and Privacy NPTEL Week 8 Answers

Q11. What is the most popular encryption system used over the web?

a) Diffie Hellman key exchange
b) RSA
c) Block cipher
d) DES

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Cyber Security and Privacy NPTEL Week 8 Answers

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