# NPTEL Blockchain and its Applications Assignment 2 Answers 2022

Are you looking for the Answers to NPTEL Blockchain and its Applications Assignment 2? This article will help you with the answer to the National Programme on Technology Enhanced Learning (NPTEL) Course “ NPTEL Blockchain and its Applications Assignment 2

## What is Blockchain and its Applications?

In the last few years, Blockchain technology has generated massive interest among governments, enterprises, and academics, because of its capability of providing a transparent, secured, tamper-proof solution for interconnecting different stakeholders in a trustless setup. In January 2021, the Ministry of Electronics and Information Technology (MeiTY), Government of India, published the first draft of the “National Strategy on Blockchain” that highlights 17 potential applications that are of national interest.

Against this backdrop, this subject will cover the basic design principles of Blockchain technology and its applications over different sectors. Additionally, the course also provides tutorials on setting up blockchain applications using one of the well-adopted permissionless blockchain platforms – Ethereum, and one permission blockchain platform – Hyperledger.

## CRITERIA TO GET A CERTIFICATE

Average assignment score = 25% of the average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF THE AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

Below you can find the answers for NPTEL Blockchain and its Applications Assignment 2

## NPTEL Blockchain and its Applications Assignment 2 Answers:-

Q1. Suppose you have eight data points — 8 to 1. The post-order traversal of the Merkle Tree is given by (here 8 means hash of 8, 43 means the combined hash of 4 and 3, and so on):

a) {8, 7, 87, 6, 5, 65, 8764, 4, 3, 43, 2, 1, 21, 4321, 87654321}
b) {8, 87, 7, 8764, 6, 65, 5, 87654321, 4, 43, 3, 4321, 2, 21, 1}
c) {1, 2, 12, 3, 4, 34, 1234, 5, 6, 56, 7, 8, 78, 5678, 12345678}
d) {87654321, 8765, 87, 8, 7, 65, 6, 5, 4321, 43, 4, 3, 21, 2, 1}

Q2. Which of the following is used to point a block in block chain:

a) Hash Pointer
b) User ID
c) Transaction ID
d) Timestamp

Q3. Digital signing of a transaction or document involves hashing the content of the document and then _______.

a) encrypting it with private key
b) encrypting it with public key
c) encrypting it with nonce
d) rehashing it

Q4. What is the objective of using a digital signature?

a) It supports the integrity of messages
b) None of the above
c) It supports both user authentication and integrity of messages
d) It supports user authentication

???? Next Week Answers: Assignment 03 ????

Q5. Digitally signing transactions by sender in Blockchain does not ensure to solve repudiation/verifiability problems. Is the above statement True or False?

a) True
b) False

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Q6. Which are the main Consensus Algorithms?

a) Proof of Work
b) Proof of Stake
c) Proof of Wager
d) Proof of Mining

Q7. Which statement(s) is correct for Fischer-Lynch-Paterson impossibility result:
I. consensus is impossible with even a single faulty node?
II. Ensures safety and liveness together

a) Both are correct
b) Only I
c) Only II
d) Both are incorrect

Q8. Why is consensus hard?
I. No notion of global time
II. faults in network
III. nodes may crash/ faulty nodes

a) I, II, II
b) I, II
c) I, III
d) II, III

Q9. In a RSA cryptosystem Alice uses two prime numbers p = 7 and q = 17 to generate her public and private keys. If the public key of Alice is 11. Then the private key of Alice is __________.

Q10. A popular public-private key implementation known as Rivest-Shamir-Adelman (RSA) algorithm is used for the Bitcoin and Ethereum Blockchain. True or False?

a) True
b) False