Electronic Cash System Quiz

What is the main benefit of using digital signatures in the context of the electronic cash system described in the document?

• They allow transactions to be reversed.

• They provide part of the solution to prevent double-spending.

• They increase the cost of transactions.

• They require the involvement of a trusted third party.

According to the document, what is still required to prevent double-spending despite the proposed solution?

• A decrease in transaction costs

• The use of physical currency

• The involvement of a trusted third party

• A reduction in the size of the transaction

What does the proof-of-work system in the electronic cash system ensure?

• It ensures that all transactions are reversible.

• It serves as proof of the sequence of events witnessed.

• It broadcasts messages on a best effort basis.

• It requires the involvement of financial institutions.

What is the role of honest nodes in the electronic cash system described?

• They must control less CPU power than any cooperating group of attacker nodes.

• They are responsible for reversing transactions.

• They collectively control more CPU power than any cooperating group of attacker nodes.

• They handle the mediation of transactions.

What is the primary function of a timestamp server in the context of digital transactions?

• To verify the identity of transaction participants

• To ensure each transaction is only spent once

• To publish the hash of a block of items to be timestamped

• To encrypt transaction data

What is the purpose of introducing a trusted central authority or mint in the digital transaction system?

• To check every transaction for double spending

• To increase the speed of transactions

• To decrease the transaction costs

• To provide anonymity to the users

According to the document, what does each owner do with the electronic coin in a transaction?

• Encrypts the coin with their private key

• Transfers the coin by digitally signing a hash of the previous transaction and public key of the next owner

• Directly transfers the coin to the next owner without any digital signature

• Stores the coin in a digital wallet for future use

What does the payee need to be aware of to prevent double spending, as mentioned in the document?

• The latest encryption algorithms

• The total number of coins in circulation

• That the previous owners did not sign any earlier transactions

• The identity of all previous and current coin owners

What is the primary purpose of implementing a proof-of-work system in a distributed timestamp server on a peer-to-peer basis?

• To increase the speed of transaction processing

• To ensure that only one version of the truth persists

• To validate transactions without a central authority

• To allocate more IPs based on CPU power

What cryptographic hash function is mentioned as being used in the proof-of-work system described?

• MD5

• SHA-256

• SHA-1

• RSA-1024