FREE Blockchain Security Training Cryptographic Security Principles Questions and Answers

Question 1

A user signs a transaction with their private key before broadcasting it to the network. Which fundamental cryptographic principle does this action primarily ensure?

Accepted Answer

Non-repudiation

Answer

Confidentiality

Answer

Availability

Answer

Anonymity

Question 2

In a Proof-of-Work consensus mechanism, miners repeatedly change a specific value in the block header to find a hash that meets the network's difficulty target. What is this value called?

Accepted Answer

Nonce

Answer

Timestamp

Answer

Merkle Root

Answer

Previous Hash

Question 3

Why is Elliptic Curve Cryptography (ECC) generally preferred over RSA for generating public-private key pairs in most blockchain implementations like Bitcoin and Ethereum?

Accepted Answer

ECC offers a higher level of security with significantly smaller key sizes, improving efficiency.

Answer

ECC is an older, more established algorithm than RSA.

Answer

ECC requires larger key sizes for the same level of security, making it more robust.

Answer

ECC is a symmetric encryption algorithm, which is faster for blockchain transactions.

Question 4

A lightweight wallet (or SPV node) needs to verify if a specific transaction is included in a block without downloading the entire block's data. Which of the following cryptographic structures makes this efficient verification possible?

Accepted Answer

Merkle Tree

Answer

Ring Signature

Answer

Symmetric Keystore

Answer

Genesis Block

Question 5

A blockchain development team needs to encrypt a large volume of off-chain data for storage. The encryption and decryption will be performed by the same secure server. Which type of cryptography would be most suitable for performance in this scenario?

Accepted Answer

Symmetric Cryptography

Answer

Asymmetric Cryptography

Answer

Hashing Algorithm

Answer

Digital Signature Algorithm

Question 6

Which of the following is a primary property of a cryptographic hash function like SHA-256 that ensures the integrity of a block's data?

Accepted Answer

Avalanche Effect

Answer

Reversibility

Answer

Variable Output Size

Answer

Key Pair Dependency

A user signs a transaction with their private key before broadcasting it to the network.Which fundamental cryptographic principle does this action primarily ensure?

A user signs a transaction with their private key before broadcasting it to the network.
Which fundamental cryptographic principle does this action primarily ensure?