Advanced Cryptographic Mechanisms in Blockchain Security BBLC Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   What is a primary advantage of Elliptic Curve Cryptography (ECC) over RSA for blockchain key generation?

   • AECC is immune to quantum attacks
   • BECC provides stronger security with shorter key lengths
   • CECC keys never expire
   • DECC is a symmetric encryption algorithm
   Reveal Solution Discussion Select an answer first
2. 7foundation · easy

   Which of the following is a potential application of homomorphic encryption in blockchain?

   • AGenerating public keys from private keys
   • BReducing the block size by compressing transaction data
   • CCreating a tamper-proof timestamp for each block
   • DPerforming calculations on encrypted transaction data without exposing it to nodes
   Reveal Solution Discussion Select an answer first
4. 8application · medium

   A user claims they did not authorize a transaction on a blockchain. The network needs to verify whether the transaction was indeed signed by the user's private key. What should the network do?

   • AUse the user's public key to verify the digital signature on the transaction.
   • BCheck the transaction's timestamp against the user's login history.
   • CHash the transaction and compare it to the user's public key.
   • DDecrypt the transaction with the user's private key.
   Reveal Solution Discussion Select an answer first
5. 9application · medium

   A blockchain auditor needs to verify that a transaction was indeed signed by the claimed sender and that the transaction data has not been altered. What should the auditor do?

   • AUse the sender's private key to re-sign the transaction and compare signatures.
   • BCompare the transaction hash to a known value from a trusted third party.
   • CVerify the digital signature using the sender's public key and check the hash of the transaction data.
   • DDecrypt the transaction with the sender's private key.
   Reveal Solution Discussion Select an answer first
6. 10expert · hard

   A research consortium wants to allow multiple parties to jointly compute a function over their combined private data without revealing individual inputs to each other. They also need to verify that the computation was performed correctly. Which combination of techniques is most appropriate?

   • AHomomorphic encryption alone, with each party encrypting their data and sending it to a central server.
   • BSecure multi-party computation (MPC) combined with zero-knowledge proofs for verifiability.
   • CDigital signatures on each party's data, with a trusted third party performing the computation.
   • DHashing all inputs and computing the function on the hashes.
   Reveal Solution Discussion Select an answer first