Foundations of Cryptography | NPTEL | Week 8 Assignment Solutions

This set of MCQ(multiple choice questions) focuses on the Foundations of Cryptography NPTEL Week 8 Assignment Solutions.

Course Layout (Answers Link)

• 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 8 Assignment Solutions

Q1. Choose the right option(s) for the authenticate-then-encrypt approach which is instantiated with a CPA-secure encryption scheme and an SCMA-secure MAC:

a) It is CCA-secure but not an authenticated encryption scheme
b) It does not provide ciphertext integrity
c) It provides ciphertext integrity
d) It is not CCA-secure

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Q2. In the key-exchange problem, the goal of the sender and receiver is to:

a) Agree upon a common public key, over a private channel
b) Agree upon a fixed common key, over a public channel
c) Agree upon a fixed common key, over a private channel
d) Agree upon a random common key, over a public channel

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Q3. Which of the following is/are sufficient to build an authenticated encryption scheme?

a) A block cipher
b) A PRG
c) A hash function
d) All of these

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Q4.

a) The above MAC is randomized and hence is SCMA-secure
b) The above MAC is deterministic and hence is CMA-secure
c) The above MAC when used in the encrypt-then-authenticate approach leads to an authenticated encryption scheme
d) The above MAC when used in the encrypt-and-authenticate approach leads to an authenticated encryption scheme

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Q5.

a) Function F’ is not a secure PRF
b) Function F’ is a secure PRF
c) Function F’ when used directly leads to a CMA-secure MAC
d) Function F’ when used directly does not lead to a CMA-secure MAC

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Foundations of Cryptography NPTEL Week 8 Assignment Solutions

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