Foundations of Cryptography | NPTEL | Week 5 Assignment Solutions

This set of MCQ(multiple choice questions) focuses on the Foundations of Cryptography NPTEL Week 5 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 5 Assignment Solutions

Q1. Choose the option(s) that is/are correct for AES

a) AES block cipher has a 128-bit block length and uses an 128-bit key
b) AES is a substitution-permutation network
c) AddRoundKey, SubBytes, ShiftRows, MixColumns are the four operations that are applied in a series of four stages
d) AES block cipher is proven to be secure against computationally bounded adversary

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Q2. Which of the following is(are) incorrect?

a) In a CCA attack, the adversary can ask for decryptions of any ciphertext of its choice
b) The CCA-security model captures a malicious adversary
c) The CCA-security model captures a passive adversary
d) Providing decryption-oracle to the adversary does not provide any additional power to the adversary

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Q3.

a) Given encryption scheme is single-message CCA secure.
b) Given encryption scheme is single-message CPA secure.
c) Given encryption scheme is neither CCA-secure, nor CPA-secure.

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Q4.

a) The construction is CMA-secure
b) The construction is SCMA-secure
c) The tag-generation algorithm is deterministic
d) The tag-generation algorithm is randomized

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Q5. Which of the following is/are false about Message Authentication Codes?

a) CBC MAC can be used to generate tag for only fixed-length messages
b) Block-wise CBC MAC initialized with IV=0^n, instead of IV being the number of message blocks is insecure
c) A secure MAC maintains the privacy of the underlying message
d) A secure MAC has to be always randomized

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Foundations of Cryptography NPTEL Week 5 Assignment Solutions

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