CBSA Security & Compliance 3

Question 1

Which consensus mechanism is generally considered most resistant to Sybil attacks due to its economic cost requirement?

Accepted Answer

Proof of Work (PoW)

Answer

Proof of Work requires real computational resources and energy expenditure, making it economically prohibitive to create enough fake identities to compromise the network.

Question 2

What is the purpose of transaction malleability protection, implemented in Bitcoin via SegWit?

Accepted Answer

To prevent alteration of transaction IDs before confirmation

Answer

Transaction malleability allowed attackers to alter a transaction's ID before it was confirmed, causing confusion in dependent systems; SegWit fixes this by separating signature data.

Question 3

In GDPR compliance for blockchain systems, the 'right to erasure' presents a fundamental challenge because:

Accepted Answer

Immutable ledgers cannot delete individual records

Answer

Blockchain's immutability means data cannot be deleted once confirmed, directly conflicting with GDPR's 'right to be forgotten' requirement.

Question 4

Which smart contract vulnerability occurs when a contract sends Ether to an external address before updating its internal state?

Accepted Answer

Reentrancy attack

Answer

Reentrancy attacks exploit the pattern where a contract calls an external contract before updating state, allowing the external contract to re-enter the original function and drain funds.

Question 5

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

Accepted Answer

To securely store and manage cryptographic keys offline

Answer

An HSM is a dedicated hardware device that securely stores cryptographic keys and performs cryptographic operations, ensuring private keys never leave the secure environment.

(CBSA) Certified Blockchain Solution Architect Practice Test

(CBSA) Certified Blockchain Solution Architect Practice Test

CBSA Security & Compliance 3