CBSA Blockchain Security and Privacy 4

Question 1

Which Hyperledger Fabric feature ensures that chaincode execution results are consistent across endorsing peers before being ordered?

Accepted Answer

Execute-Order-Validate (EOV) architecture

Answer

PBFT ordering

Answer

Raft leader election

Answer

Gossip protocol

Question 2

An oracle manipulation attack on a DeFi protocol most directly exploits which weakness?

Accepted Answer

Reliance on a single or manipulable off-chain price feed

Answer

Flawed consensus mechanism

Answer

Overflowing integer arithmetic in smart contracts

Answer

Insufficient gas limits

Question 3

What does 'key ceremony' refer to in blockchain PKI security?

Accepted Answer

A formal, witnessed procedure for generating and splitting cryptographic root keys with audit controls

Answer

The process of generating genesis block keys

Answer

Smart contract deployment to mainnet

Answer

The onboarding ritual for new validator nodes

Question 4

Which attack targets the peer-to-peer network layer of a blockchain node by surrounding it with malicious peers to control all its inbound and outbound connections?

Accepted Answer

Eclipse attack

Answer

Man-in-the-middle attack

Answer

Selfish mining

Answer

Transaction flooding

Question 5

In the context of blockchain cryptography, what is a 'nonce' primarily used for in proof-of-work mining?

Accepted Answer

An arbitrary number miners iterate to find a hash meeting the difficulty target

Answer

Identifying the miner's wallet address

Answer

Encrypting the block header

Answer

Signing the coinbase transaction

Question 6

Which GDPR principle conflicts most directly with blockchain's core immutability property?

Accepted Answer

Right to erasure (right to be forgotten)

Answer

Data minimization

Answer

Purpose limitation

Answer

Lawful basis for processing

Question 7

What is the role of a Hardware Security Module (HSM) in a blockchain deployment?

Accepted Answer

Securely generating, storing, and using cryptographic keys in tamper-resistant hardware

Answer

Accelerating consensus algorithm computation

Answer

Providing off-chain data feeds to smart contracts

Answer

Running smart contract bytecode in an isolated environment