FREE Cryptocurrency Cryptography and Hashing Questions and Answers

Question 1

Which of the following is NOT a fundamental property of a cryptographic hash function used in blockchain technology?

Accepted Answer

Reversibility

Answer

Deterministic

Answer

Collision Resistance

Answer

Pre-image Resistance

Question 2

A user wants to send a secure message to another user on a cryptocurrency network, ensuring both confidentiality and authenticity. The sender uses the recipient's public key to encrypt the message. What must the recipient use to decrypt the message and what does this process primarily ensure?

Accepted Answer

The recipient's private key, to ensure confidentiality.

Answer

The sender's public key, to ensure non-repudiation.

Answer

The recipient's public key, to ensure confidentiality.

Answer

The sender's private key, to ensure integrity.

Question 3

In the context of Bitcoin's Proof-of-Work, miners repeatedly hash the block header with a changing nonce. What is the primary goal of this process?

Accepted Answer

To find a hash value that is below a certain target value.

Answer

To find a hash value that is larger than the target difficulty.

Answer

To create a digital signature for the block.

Answer

To encrypt the transactions within the block for security.

Question 4

A developer is creating a new cryptocurrency and needs to choose a hashing algorithm. They are deciding between SHA-256 and Keccak-256. Which major cryptocurrency is primarily associated with Keccak-256?

Accepted Answer

Ethereum

Answer

Bitcoin

Answer

Litecoin

Answer

Dogecoin

Question 5

To create a digital signature for a transaction, a user's wallet software first hashes the transaction data. What is the next step in this process?

Accepted Answer

The hash is encrypted with the user's private key.

Answer

The hash is encrypted with the recipient's public key.

Answer

The hash is broadcast to the network for verification.

Answer

The hash is combined with the previous block's hash.

Question 6

What is the 'avalanche effect' in the context of cryptographic hashing?

Accepted Answer

A small change in the input data results in a completely different hash output.

Answer

The process of multiple hashes cascading to form a blockchain.

Answer

A network failure caused by too many simultaneous hash calculations.

Answer

The property that two different inputs will eventually produce the same hash.