Blockchain Technology UK Quiz 1

A blockchain is a

• distributed database or ledger shared among a computer network's nodes.

• advanced database mechanism that allows transparent information sharing within a business network.

• a distributed ledger with growing lists of records (blocks) that are securely linked together via cryptographic hashes.

• A block is a collection of data that is linked to other blocks chronologically in a virtual chain.

• All are correct

In the network security .................................... means the science of transforming the messages to make them secure and immune to attacks.

• Encryptionography

• Cryptography

• Steganography

• Hashography

Asymmetric-Key Encipherment .........................

• To send a secure message, the sender first encrypts the message using senders public key. To decrypt the message, the receiver uses its own private key.

• To send a secure message, the sender first encrypts the message using receiver’s public key. To decrypt the message, the receiver uses its own private key.

• To send a secure message, the sender first encrypts the message using receiver’s private key. To decrypt the message, the receiver uses its own Public key.

• To send a secure message, the sender first encrypts the message using receiver’s private key. To decrypt the message, the receiver uses its senders private key.

Which of these is not an HASH algorithm

• SHA256

• MD5

• Blake256

• Diffe-Helman

Digital Signature

• They are created using symmetric encryption techniques.

  The sender uses their private key to generate a digital signature, which can be verified by anyone who has access to the sender's public key.

• They are created using asymmetric encryption techniques.

  The sender uses their private key to generate a digital signature, which can be verified by anyone who has access to the sender's public key.

• They are created using asymmetric encryption techniques.

  The sender uses receivers private key to generate a digital signature, which can be verified by anyone who has access to the sender's public key.

• They are created using asymmetric encryption techniques.

  The sender uses their private key to generate a digital signature, which can be verified by anyone who has access to the receivers public key.

Which of the following is NOT a Consensus mechanisms

• Proof of Work(POW)

• Proof of Stake(POS)

• Byzantine Fault Tolerance (BFT)

• Hierarchical Deterministic Wallets(HDW)

Identify the equation for elliptic curve

• y2 = x3 + Ax + B

• y3 = x3 + Ax + B

• y2 = x2 + Ax + B

• y2 = x3 + Ax + By+C

Which of these is the correct definition of DLT

• Distributed Ledger Technology (DLT) is essentially a decentralized data storage technology that can perform data sharing, synchronization and replication in a network of multiple network nodes, multiple physical addresses or multiple organizations.

• A distributed ledger is the consensus of replicated, shared, and synchronized digital data that is geographically spread across many sites, countries, or institutions

• A distributed ledger is a database that is consensually shared and synchronized across multiple sites, institutions, or geographies, accessible by multiple people. It allows transactions to have public "witnesses."

• Distributed ledger technology (DLT) is the technological infrastructure and protocols that allow simultaneous access, validation, and record updating across a networked database. DLT is the technology blockchains are created from, and the infrastructure allows users to view any changes and who made them, reduces the need to audit data, ensures data is reliable, and only provides access to those that need it.

• All of the above

Which are all the techniques that enables DLT systems to implement privacy-enhancing features that protect sensitive information while still maintaining transparency and auditability.

• Zero-knowledge proofs,

• homomorphic encryption

• Ring signatures

• All of the Above

ECC 256 bit key provides same level of security as

• RSA1024

• RSA256

• RSA512

• RSA3072