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

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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

**Answer:** b), c)

**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

**Answer:** a), c), d)

**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.

**Answer:** a), b)

**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

**Answer:** a), b), d)

**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

**Answer:** a), b), d)

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altafweek 6 is going to be due tomorrow

YashYes, adding soon!

parasPlease send answers for week 6 quickly

YashHi Paras,

Answers had been added for Week 6. Check it now.

NaveenBro….week6 answers

YashGo to this page for answers: Cryptography Week 6 Answers

Rohan SharmaBhai upload krdo week-6 🙏

YashNow, its uploaded. 🙂 Check Week 6 answers