CBSE - Certified Blockchain Security Expert Blockchain Cryptography Fundamentals Questions and Answers

Question 1

Which of the following cryptographic primitives is primarily used in blockchain to ensure data integrity and create a unique, fixed-size fingerprint of transaction data?

Accepted Answer

Cryptographic Hash Functions

Answer

Symmetric Encryption

Answer

Asymmetric Encryption

Answer

Digital Signatures

Question 2

A blockchain development team is choosing a public-key cryptography algorithm for their new platform. They require high security with smaller key sizes to optimize for speed and reduce storage demands. Which algorithm best meets these requirements?

Accepted Answer

ECC (Elliptic Curve Cryptography)

Answer

RSA (Rivest-Shamir-Adleman)

Answer

AES (Advanced Encryption Standard)

Answer

SHA-256

Question 3

In a blockchain transaction, what is the primary purpose of a digital signature?

Accepted Answer

To provide proof of the sender's identity (authentication) and guarantee the message has not been altered (non-repudiation and integrity).

Answer

To encrypt the transaction data for confidentiality.

Answer

To ensure the transaction can be reversed if incorrect.

Answer

To reduce the size of the transaction data for faster processing.

Question 4

A user sends a cryptocurrency transaction. The transaction is combined with several others into a block. Which data structure is used to efficiently and securely verify that this specific transaction is included in the block without needing to download and check every single transaction?

Accepted Answer

Merkle Tree

Answer

Linked List

Answer

Binary Search Tree

Answer

Hash Table

Question 5

What is the key difference between cryptographic hashing and encryption in the context of blockchain security?

Accepted Answer

Hashing is a one-way function primarily for data integrity, while encryption is a two-way function for data confidentiality.

Answer

Encryption is a one-way function, while hashing is a two-way function.

Answer

Hashing is used for data confidentiality, while encryption is used for data integrity.

Answer

Hashing is a reversible process, while encryption is irreversible.

Question 6

A security auditor is reviewing a blockchain's cryptographic implementation. They note that the system uses a private key to create a digital signature and a corresponding public key to verify it. This model is an example of which type of cryptography?

Accepted Answer

Asymmetric Cryptography

Answer

Symmetric Cryptography

Answer

Hash-based Cryptography

Answer

Secret Key Cryptography