Blockchain and Cryptography Quiz

What is a blockchain?

• A) A type of database that stores data in a central location.

• B) A decentralized ledger that records transactions in a chronological order.

• C) A traditional banking system used for digital transactions.

• D) A method of securing passwords on the internet.

Which cryptographic technique is primarily used in blockchain to ensure data integrity?

• A) Symmetric encryption

• B) Asymmetric encryption

• C) Hash functions

• D) Digital signatures

What is a hash function in the context of blockchain?

• A) A function that encrypts data using a symmetric key.

• B) A function that compresses data to save storage space.

• C) A one-way function that converts input data into a fixed-size string of characters.

• D) A function that allows two parties to securely exchange data.

What is the primary purpose of a digital signature in blockchain transactions?

• A) To encrypt the transaction data.

• B) To verify the authenticity and integrity of the transaction.

• C) To anonymize the transaction sender.

• D) To compress the transaction data for storage.

Which consensus algorithm is used by Bitcoin?

• A) Proof of Stake (PoS)

• B) Proof of Work (PoW)

• C) Delegated Proof of Stake (DPoS)

• D) Practical Byzantine Fault Tolerance (PBFT)

What is a public key in blockchain cryptography?

• A) A key used to decrypt data sent to the owner.

• B) A key that is kept secret and used to sign transactions.

• C) A key that is shared openly and used to encrypt data.

• D) A key used to create new blocks on the blockchain.

What does "mining" refer to in the context of blockchain?

• A) The process of generating cryptographic keys.

• B) The act of verifying transactions and adding them to the blockchain.

• C) The extraction of valuable information from the blockchain.

• D) The removal of outdated transactions from the blockchain.

Which cryptographic algorithm is commonly used to secure blockchain wallets?

• A) RSA

• B) AES

• C) SHA-256

• D) ECDSA

What is a "smart contract" in blockchain technology?

What is a "block" in a blockchain?

• A) A file that stores a list of transactions.

• B) A cryptographic key used to sign transactions.

• C) A protocol for consensus mechanisms.

• D) A node that validates transactions on the network.