Securing Blockchain Transactions with Cryptographic Techniques BFC Practice Questions (Page 10)

Questions 46–47

1. 46foundation · easy

   Why does hashing a public key to generate an address enhance security?

   • AIt encrypts the address so only the owner can read it
   • BIt makes the address longer and more complex
   • CIt allows the private key to be recovered from the address
   • DIt hides the public key until it is first used in a transaction
   Reveal Solution Discussion Select an answer first
2. 47application · medium

   A blockchain network uses a proof-of-stake consensus mechanism. Validators are selected based on the number of tokens they hold and stake. Which cryptographic property is essential to ensure that the selection process is fair and cannot be manipulated by a validator?

   • AA digital signature that is generated by the validator's private key and included in the block proposal.
   • BA hash of the previous block that is used directly as the selection seed.
   • CA symmetric encryption key shared among all validators to encrypt the selection process.
   • DA verifiable random function (VRF) that produces an unpredictable but verifiable output based on the validator's private key and the current block context.
   Reveal Solution Discussion Select an answer first