This set of MCQ(multiple choice questions) focuses on the **Foundations of Cryptography** **NPTEL Week 2 Assignment Solutions**.

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**Assignment answers** - Week 2: Assignment answers
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**Assignment answers** - Week 6:
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**Assignment answers** - Week 12:
**Assignment answers**

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**Foundations of Cryptography** NPTEL Week 2 Assignment Solutions

**Q1.** Let G be a secure PRG. Then which of the following is not a secure PRG?

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

**Q2.** Which of the following is(are) true about PRG?

a) A PRG is a deterministic algorithm

b) A PRG is a randomized algorithm

c) We can construct a PRG, which is secure against a computationally unbounded adversary

d) A computationally unbounded adversary can always determine the seed of a secure PRG, by seeing the output of the PRG

**Answer:** a), d)

**Q3.** Select the incorrect statement(s):

a) While using a PRG, same key can be used for every instance of encryption

b) If G(s) is a secure PRG, then G_{1} (s) ≝ G(s) || G(s+2) is also a secure PRG

**Answer:** a), b)

**Q4.** Let G:{0,1}^{m} => {0,1}^{n} be a secure PRG. Then which of the following is/are false?

**Answer:** c), d)

**Q5. **

a) Function G is a PRG

b) Function G is a true random number generator

c) Function G is not a PRG

**Answer:** c)

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