A blockchain network uses ECC-based signatures. A user reports that their transaction was signed without their consent. The network must determine if the signature is valid. What should the network do?

Verify the signature using the user's public key; if valid, the transaction is considered authorized.

Ask the user to provide their private key for verification.

Invalidate the transaction if the user claims it was not authorized.

Check the user's IP address and device history.

A blockchain developer is designing a system to detect tampering in a large dataset. They need to verify that a specific record has not been altered, but they want to avoid recomputing hashes for the entire dataset. Which approach should they use?

Use a digital signature for each record.

Use a single hash of the entire dataset.

Use homomorphic encryption to compute a checksum.

Use a Merkle tree to store hashes of records, allowing verification of any record with a short proof.

Which property of a cryptographic hash function is most directly responsible for ensuring data integrity in a blockchain?

Fixed output length — the hash is always the same size regardless of input size

Preimage resistance — it is infeasible to find an input that produces a given output

Avalanche effect — a small change in input produces a significantly different hash output

Determinism — the same input always produces the same output

EC-CouncilBlockchain Business Leader Certification

Domain 2Objective 2

Advanced Cryptographic Mechanisms in Blockchain Security BBLC Practice Questions (Page 6)

Part of the Cryptography and Security in Blockchain domain, which makes up ~13% of our current practice bank.

50questions here

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Questions 26–30

26expert · hard
A blockchain network uses ECC-based signatures. A user reports that their transaction was signed without their consent. The network must determine if the signature is valid. What should the network do?
Select an answer first
27foundation · easy
Which security property is provided by a digital signature because the private key is known only to the signer?
Select an answer first
28expert · hard
A blockchain developer is designing a system to detect tampering in a large dataset. They need to verify that a specific record has not been altered, but they want to avoid recomputing hashes for the entire dataset. Which approach should they use?
Select an answer first
29foundation · easy
Which hashing algorithm is most commonly associated with Bitcoin's proof-of-work and block linking?
Select an answer first
30foundation · easy
Which property of a cryptographic hash function is most directly responsible for ensuring data integrity in a blockchain?
Select an answer first

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Advanced Cryptographic Mechanisms in Blockchain Security BBLC Practice Questions (Page 6)

Questions 26–30

A blockchain network uses ECC-based signatures. A user reports that their transaction was signed without their consent. The network must determine if the signature is valid. What should the network do?

Which security property is provided by a digital signature because the private key is known only to the signer?

A blockchain developer is designing a system to detect tampering in a large dataset. They need to verify that a specific record has not been altered, but they want to avoid recomputing hashes for the entire dataset. Which approach should they use?

Which hashing algorithm is most commonly associated with Bitcoin's proof-of-work and block linking?

Which property of a cryptographic hash function is most directly responsible for ensuring data integrity in a blockchain?

Keep studying — Cryptography and Security in Blockchain