Prawin Kurdeg

 Which statement describes data-sharing in a blockchain?    Which statement describes data-sharing in a blockchain? A. Organizations share different versions of the same data on their local servers.  B. Organizations share only data related to money and finance. C. Organizations share a single version of data.  D. Organizations share separate versions of data.  The correct statement is: c. organizations share a single version of data. In a blockchain, organizations participating in the network share a single version of data. The blockchain serves as a distributed ledger that is synchronized and replicated across multiple nodes or computers participating in the network. All participants have access to the same data, and any changes or transactions made on the blockchain are recorded and verified by consensus mechanisms. This shared version of data ensures transparency, eliminates the need for reconciliation between different versions, and enhances trust amon...

  Which model describes how data is written to a blockchain?  Which model describes how data is written to a blockchain?  A. rewrite always  B.append only  C.append never  D.full read and write  The correct answer is: B. append only The model that describes how data is written to a blockchain is "append only." In a blockchain, once a block of data is added to the chain, it is typically considered immutable and cannot be altered or removed. New data is added to the blockchain by appending it as a new block. This ensures the integrity and chronological order of the data stored on the blockchain. The append-only nature of a blockchain provides a transparent and auditable record of transactions or information. It allows participants in the blockchain network to verify the history of data and prevents unauthorized modifications. This property is a fundamental aspect of the security and trustworthiness of blockchain technology.

 What is the difference between encryption and hashing?  What is the difference between encryption and hashing? A. Encryption is reversible, while hashing is not. B. Encryption requires less information to begin the process than hashing. C. Hashing requires less information to begin the process than encryption. D. Hashing is reversible, while encryption is not.  The correct answer is: A. Encryption is reversible, while hashing is not. Encryption and hashing are both cryptographic techniques but serve different purposes and have distinct characteristics. The main difference lies in their reversibility. Encryption is a reversible process where data is transformed using an encryption algorithm and a key to convert it into an unreadable form called ciphertext. The ciphertext can be decrypted back into its original form using the decryption algorithm and the corresponding key. Encryption is commonly used to protect sensitive information during transmission or storage, ensuring...

 What is an advantage of using blockchain technology?  What is an advantage of using blockchain technology? A. There is almost no opportunity for biased, inaccurate, or altered data to get into the systems. B. Since it's an emerging technology, it's critical to invest in blockchain before anyone else.     C. Blockchain technology makes data easy to edit.  D. Blockchain is centralized.  The correct answer is: A. There is almost no opportunity for biased, inaccurate, or altered data to get into the systems. An advantage of using blockchain technology is that it provides a high degree of data integrity and immutability.  Once data is recorded on a blockchain, it becomes extremely difficult to alter or manipulate without the consensus of the network participants.  The decentralized and distributed nature of blockchain ensures that multiple copies of the ledger are maintained across the network, making it challenging for any single entity to tampe...

 How could the adoption of blockchain within a supply chain help the world become more sustainable and, in some cases, eco-friendly? A.  Consumers will be able to store their personal identifiable information for recurring purchases. B. Consumers could still purchase items at a store even if they forgot their wallet and phone at home. C. Consumers could easily return and get refunds for products that didn't meet their expectations. D. Consumers will be able to effectively track where the components of their product were sourced.   Adopting blockchain within a supply chain can help the world become more sustainable and eco-friendly by enabling effective tracking of the components of a product's supply chain. Blockchain provides a transparent and immutable ledger that records every transaction and movement of goods along the supply chain. This enables consumers to trace and verify the origin of each component or ingredient used in a product. By having visibility into...

How can a blockchain be used to manage sharing of personal records? A. by requiring a proof-of-work for access B. by storing consent and revocations to access the off-chain records C. by mandating that each individual participant enters a smart contract D. by creating a consensus mechanism for entering data The correct answer is: By storing consent and revocations to access the off-chain records. Blockchain technology can be utilized to manage the sharing of personal records by storing consent and revocations to access the off-chain records. By leveraging blockchain's decentralized and immutable nature, individuals can grant or revoke access to their personal records through smart contracts stored on the blockchain. These smart contracts contain the consent and permission settings, allowing individuals to control who can access their records and for what purposes. The blockchain ensures that these consent settings are transparent, tamper-proof, and can be audited, providing individ...

  What is the purpose of "post-quantum" cryptography? A-To create encryption methods that quantum computers cannot crack B-To eliminate all encryption methods programmed on classical computers C-To require users to own quantum computers in order to send data securely D-To use quantum computers to create more secure encryption methods. The correct answer is A - To create encryption methods that quantum computers cannot crack. "Post-quantum" cryptography refers to the development of cryptographic algorithms that are resistant to attacks by quantum computers. Quantum computers have the potential to break many of the commonly used cryptographic algorithms that rely on the difficulty of certain mathematical problems, such as factoring large numbers or solving the discrete logarithm problem. Quantum computers leverage quantum mechanical phenomena to perform computations, which can potentially solve these mathematical problems much more efficiently than classical computers...