Foundations of Cryptography | NPTEL | Week 4 Assignment Solutions

This set of MCQ(multiple choice questions) focuses on the Foundations of Cryptography NPTEL Week 4 Assignment Solutions.

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• Week 1: Assignment answers
• Week 2: Assignment answers
• Week 3: Assignment answers
• Week 4: Assignment answers
• Week 5: Assignment answers
• Week 6: Assignment answers
• Week 7: Assignment answers
• Week 8: Assignment answers
• Week 9: Assignment answers
• Week 10: Assignment answers
• Week 11: Assignment answers
• Week 12: Assignment answers

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Foundations of Cryptography NPTEL Week 4 Assignment Solutions

Q1. Which of the following is/are false about modes of operation?

a) A sequence of n messages can be encrypted using block cipher by making less than n calls to a secure PRF
b) Cipher-text computation is parallelizable in CTR mode.
c) Plain text of any length can be encrypted in OFB mode
d) Stateful variant of Counter mode is secure where as that of OFB mode is insecure

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Q2. Consider the stateless variant of CBC-mode of encryption with a block cipher having a 256-bit key and 128-bit block length to encrypt a 512-bit message. The length of the resulting ciphertext in bits is:

a) 256
b) 128
c) 640
d) None of these

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Q3. Which of the following is(are) true about Feistel and SPN networks?

a) SPRP can be constructed using 4-round Feistel network
b) Diffusion is used to produce avalanche effect in an SPN
c) S-boxes are used to produce confusion in an SPN
d) All of these

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Q4.

a)is a secure PRF
b)

is a secure PRP
c)is a secure SPRP
d)can be used to instantiate the CTR mode of block cipher

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Q5.

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Foundations of Cryptography NPTEL Week 4 Assignment Solutions

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