Asymmetric Cryptography and Key Algorithms BDC Practice Questions (Page 6)

Questions 26–30

1. 26foundation · easy

   In asymmetric cryptography, what is the fundamental relationship between the public key and the private key?

   • AThey are a pair where the private key is derived from the public key using a one-way function.
   • BThey are two independent keys that are mathematically unrelated but used together.
   • CThey are a mathematically related pair, where the public key can be derived from the private key, but the private key cannot be feasibly derived from the public key.
   • DThey are identical keys that are used interchangeably for encryption and decryption.
   Reveal Solution Discussion Select an answer first
2. 27expert · hard

   A developer is comparing RSA and ECC for a new blockchain project. The project requires fast signature verification and low bandwidth for signatures. Which algorithm is more suitable and why?

   • ARSA, because it is more widely supported.
   • BECC, because it offers smaller signatures and faster verification at equivalent security levels.
   • CECC, because it is a symmetric algorithm.
   • DRSA, because it has smaller key sizes.
   Reveal Solution Discussion Select an answer first
4. 28expert · hard

   A developer is designing a system where users can prove ownership of a blockchain address without revealing their public key. Which technique is appropriate?

   • ASign a challenge message with the private key and return the signature.
   • BPublish the public key on the blockchain.
   • CSend the private key to the verifier.
   • DEncrypt a message with the public key and send it back.
   Reveal Solution Discussion Select an answer first
5. 29application · medium

   A user loses their private key for a blockchain wallet. What is the consequence?

   • AThe user can recover the key by contacting the blockchain network.
   • BThe user can reset the private key like a password.
   • CThe user permanently loses access to funds in that wallet.
   • DThe user can use the public key to sign transactions.
   Reveal Solution Discussion Select an answer first
6. 30application · medium

   A developer is explaining asymmetric cryptography to a colleague. Which statement accurately describes the relationship between public and private keys?

   • ABoth keys are kept secret.
   • BThe public key can be derived from the private key, but not vice versa.
   • CData encrypted with the public key can only be decrypted with the private key.
   • DThe private key is used for encryption and the public key for decryption.
   Reveal Solution Discussion Select an answer first