CBE - Certified Blockchain Expert Cryptographic Principles in Blockchain Questions and Answers

Question 1

Which cryptographic principle is primarily responsible for ensuring the integrity and immutability of data within a blockchain by creating a unique, fixed-size output from variable-sized transaction data?

Accepted Answer

Hashing

Answer

Symmetric Encryption

Answer

Digital Signatures

Answer

Public Key Infrastructure (PKI)

Question 2

A user wants to authorize a cryptocurrency transaction on a blockchain network. Which of the following cryptographic tools allows the user to prove ownership of the funds and authorize the transfer without revealing their secret key?

Accepted Answer

Digital Signature

Answer

Merkle Root

Answer

Proof of Work

Answer

Cryptographic Nonce

Question 3

In the context of a Bitcoin block, what is the primary purpose of a Merkle Tree?

Accepted Answer

To efficiently and securely verify the integrity of a large set of transactions.

Answer

To encrypt the transaction data for confidentiality.

Answer

To reach consensus among network nodes.

Answer

To generate new private keys for each transaction.

Question 4

Elliptic Curve Cryptography (ECC) is widely used in blockchains like Bitcoin and Ethereum. What is its primary advantage over older algorithms like RSA?

Accepted Answer

It provides the same level of security with smaller key sizes.

Answer

It is resistant to quantum computing attacks.

Answer

It uses symmetric keys for faster encryption.

Answer

It is a simpler algorithm to implement.

Question 5

A developer is building a new blockchain protocol and needs to select a hashing algorithm. Which of the following is a critical property for the chosen algorithm to prevent attackers from finding two different inputs that produce the same hash output?

Accepted Answer

Collision resistance

Answer

Pre-image resistance

Answer

Deterministic nature

Answer

Fixed output size

Question 6

In a public-key cryptography system as used in blockchain, what is the relationship between the private key and the public key?

Accepted Answer

The public key is mathematically derived from the private key, but it is computationally infeasible to reverse the process.

Answer

The private key is derived from the public key.

Answer

The public key is used to encrypt data, and the private key is used to decrypt it.

Answer

Both keys are identical and shared between the sender and receiver for secure communication.