How does the difficulty adjustment in proof-of-work relate to the nonce?

Difficulty adjustment sets the nonce to a specific value

Difficulty adjustment is unrelated to the nonce

Difficulty adjustment determines how many nonces must be tried on average to find a valid block

Difficulty adjustment changes the length of the nonce

A user wants to store their cryptocurrency in a way that is protected from online attacks (e.g., phishing, malware) but still allows them to make transactions from their mobile phone. Which solution best meets this requirement?

Use a multi-signature wallet where the private key is split into parts stored on multiple online services.

Use a hardware wallet that stores the private key offline and signs transactions when connected to the phone via Bluetooth or USB.

Write the private key on a piece of paper and keep it in a safe; use a mobile wallet that imports the key when needed.

Store the private key in a mobile wallet app that is protected by a password.

In blockchain, what is a common application of zero-knowledge proofs?

To speed up block propagation across the network

To generate new blocks without mining

To increase the block size limit

To verify a transaction's validity without revealing the transaction's details

What is a post-quantum cryptographic approach being considered for blockchain?

Using lattice-based cryptography

Using SHA-256 as a signature scheme

Using symmetric encryption for all transactions

A blockchain architect is evaluating the risk of quantum computers breaking current digital signatures. They want to prepare for a future migration. Which approach is most aligned with post-quantum readiness?

Use longer hash functions to protect against quantum attacks

Switch to larger RSA keys to resist quantum attacks

Wait until quantum computers are commercially available before making any changes

Adopt a hybrid signature scheme that combines current ECC with a post-quantum algorithm

EC-CouncilBlockchain Business Leader Certification

Domain 2Objective 1

Cryptographic Principles and Their Role in Blockchain BBLC Practice Questions (Page 1)

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

43questions here

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9concepts

Questions 1–5

1foundation · easy
How does the difficulty adjustment in proof-of-work relate to the nonce?
Select an answer first
2application · medium
A user wants to store their cryptocurrency in a way that is protected from online attacks (e.g., phishing, malware) but still allows them to make transactions from their mobile phone. Which solution best meets this requirement?
Select an answer first
3foundation · easy
In blockchain, what is a common application of zero-knowledge proofs?
Select an answer first
4foundation · easy
What is a post-quantum cryptographic approach being considered for blockchain?
Select an answer first
5application · medium
A blockchain architect is evaluating the risk of quantum computers breaking current digital signatures. They want to prepare for a future migration. Which approach is most aligned with post-quantum readiness?
Select an answer first

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