Blockchain Basics Week 3 Quiz Answer

Blockchain Basics Week 3 Quiz Answer

Week 3
Algorithms & Techniques

Week 3 ---- Quiz 1 Answers

Question 1)

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

• True
• False

Question 2)

For the simple symmetric key example discussed in the lecture, it is easy to derive the “secret” key from the encrypted data. True or False?

• True
• False

Question 3)

256 bit ECC key-pair is equivalent in strength to approximately 3072-bit RSA key-pair. Thus ECC is much stronger encryption than RSA method. True or False?

• True
• False

Week 3 ---- Quiz 2 Answers

Question 1)

What is one of the requirements of secure hashing function?

• It is log function
• It is an ECC function
• It is a one way function
• It is a secret function

Question 2)

What type of hash is used when there is a fixed number of items to be hashed, such as the items in a block header, and we are verifying the composite block integrity?

• Either
• Complex hash
• Simple Hash
• Tree-structured Hash

Question 3)

What type of hash function is used, when there is variable number of items to be hashed, such as the many state changes in a block?

• Simple Hash
• Either
• Complex hash
• Tree-structured Hash

Question 4)

Keccak 256 is a commonly used algorithm for hash generation in the Ethereum blockchain. True or False?

• True
• False

Week 3 ---- Quiz 3 Answers

Question 1)

Digital signing of a transaction/document involves, hashing the content of the document and then __.

• rehashing it
• encrypting it with nonce
• encrypting it with public key
• encrypting it with private key

Question 2)

In Ethereum, the block hash is the hash of all the elements in the?

• State tree
• Receipt tree
• Block header
• Transaction hash tree

Question 3)

Merkle tree hash is used for computing hash.

• state root
• receipt root
• transaction root
• all of the above

Question 4)

Block hash allows for the formation of the chain link by embedding the previous block hash in the current block header. True or False?

• True
• False

Question 5)

If a participant node tampers with a block, it results in __.

• mismatch of hash values
• the local chain of node rendered in an invalid state
• hash changing
• All of the above

Blockchain Basics Week Coursera Answer

• Blockchain Basics Week 1 Quiz Answer

• Blockchain Basics Week 2 Quiz Answer

• Blockchain Basics Week 3 Quiz Answer

• Blockchain Basics Week 4 Quiz Answer