CBE - Certified Blockchain Expert Blockchain Security and Privacy Questions and Answers

Question 1

An analyst observes that a user's cryptocurrency wallet has received multiple, unsolicited, extremely small transactions from various unknown addresses.
What type of attack is this user MOST likely experiencing, which aims to de-anonymize the wallet owner by linking their addresses together?

Accepted Answer

A Dusting Attack

Answer

A Sybil Attack

Answer

An Eclipse Attack

Answer

A Phishing Attack

Question 2

Which privacy-enhancing cryptographic method allows a member of a group to sign a transaction on behalf of the group, making it computationally infeasible to determine which specific member's key was used for the signature?

Accepted Answer

Ring Signatures

Answer

Stealth Addresses

Answer

Zero-Knowledge Proofs (ZKPs)

Answer

Sharding

Question 3

A startup holds a significant amount of its treasury in cryptocurrency. To prevent a single point of failure and protect against internal theft, they need a solution that requires approval from multiple executives before any funds can be moved. Which security mechanism is MOST effective for this requirement?

Accepted Answer

A multi-signature (multi-sig) wallet

Answer

A hierarchical deterministic (HD) wallet

Answer

A time-locked smart contract

Answer

A cold storage paper wallet

Question 4

Which of the following network-level attacks on a blockchain node involves isolating it from the rest of the honest network and connecting it exclusively to attacker-controlled nodes, potentially leading to double-spending or selfish mining?

Accepted Answer

Eclipse Attack

Answer

Sybil Attack

Answer

Man-in-the-Middle Attack

Answer

Routing Attack

Question 5

In the context of blockchain technology, what is a primary benefit of using zk-SNARKs (Zero-Knowledge Succinct Non-Interactive Arguments of Knowledge) beyond providing privacy?

Accepted Answer

They enable data compression, which can significantly improve scalability.

Answer

They increase the on-chain data storage requirements for transactions.

Answer

They are exclusively used for Proof-of-Stake consensus mechanisms.

Answer

They eliminate the need for private keys to authorize transactions.

Question 6

A decentralized governance protocol allows token holders to vote on proposals. An attacker attempts to gain disproportionate influence by creating thousands of new, low-balance addresses and using them to vote for a malicious proposal. This attack is best described as a:

Accepted Answer

Sybil Attack

Answer

51% Attack

Answer

Replay Attack

Answer

Dusting Attack

An analyst observes that a user's cryptocurrency wallet has received multiple, unsolicited, extremely small transactions from various unknown addresses.What type of attack is this user MOST likely experiencing, which aims to de-anonymize the wallet owner by linking their addresses together?

An analyst observes that a user's cryptocurrency wallet has received multiple, unsolicited, extremely small transactions from various unknown addresses.
What type of attack is this user MOST likely experiencing, which aims to de-anonymize the wallet owner by linking their addresses together?