CBSE Architectural and Design Security 2

Question 1

In a permissioned blockchain architecture, which access control model is most appropriate for enforcing role-based restrictions on transaction submission?

Accepted Answer

Role-Based Access Control (RBAC)

Answer

RBAC maps organizational roles directly to permitted transaction types, aligning with the structured membership model of permissioned blockchains.

Question 2

What cryptographic mechanism enables a node to prove it possesses a valid credential without revealing the credential itself during network authentication?

Accepted Answer

Zero-knowledge proof

Answer

Zero-knowledge proofs let a prover convince a verifier of a statement's truth without disclosing the underlying secret.

Question 3

A blockchain design uses a separate chain for high-frequency micropayments that periodically settles to the main chain. This pattern is best described as:

Accepted Answer

Sidechain

Answer

A sidechain runs independently with its own consensus and periodically anchors or transfers assets back to the main chain.

Question 4

Which threat does the 'nothing-at-stake' problem primarily affect in blockchain consensus design?

Accepted Answer

Proof-of-Stake validator equivocation

Answer

In early Proof-of-Stake designs, validators faced no cost for signing multiple conflicting forks, enabling double-spend attacks without economic penalty.

Question 5

When designing a multi-signature wallet contract, what is the primary security risk of setting the required-signature threshold too low?

Accepted Answer

Reduced resistance to key compromise enabling unauthorized fund transfer

Answer

A low threshold means compromising fewer keys is sufficient for an attacker to authorize transactions unilaterally.

(CBSE) Certified Blockchain Security Expert Practice Test

(CBSE) Certified Blockchain Security Expert Practice Test

CBSE Architectural and Design Security 2