Asymmetric Cryptography and Key Algorithms BDC Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   What is the result of encrypting a message with a user's private key?

   • AIt creates a digital signature that provides authenticity and integrity.
   • BIt provides confidentiality, as only the public key can decrypt it.
   • CIt produces a ciphertext that can only be decrypted by the same private key.
   • DIt generates a symmetric key for future encryption.
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   In a blockchain system, a user's wallet address is derived from the public key. What is the primary purpose of this derivation?

   • ATo replace the private key for signing.
   • BTo hide the user's identity completely.
   • CTo encrypt the user's transactions.
   • DTo provide a shorter, standardized identifier for receiving funds.
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   What is the primary purpose of a certificate revocation list (CRL) in public key infrastructure?

   • ATo store all public keys that have ever been generated.
   • BTo list certificates that have been revoked before their expiration date.
   • CTo distribute public keys to all users in a network.
   • DTo provide a backup of private keys in case they are lost.
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   Which asymmetric algorithm is commonly used for secure key exchange over an insecure channel, allowing two parties to agree on a shared secret without directly transmitting it?

   • AAdvanced Encryption Standard (AES)
   • BDiffie-Hellman (DH)
   • CRSA
   • DElliptic Curve Cryptography (ECC)
   Reveal Solution Discussion Select an answer first
6. 20expert · hard

   A company is building a secure document exchange. Each document is encrypted with a randomly generated symmetric key, and that symmetric key is then encrypted with the recipient's RSA public key. The encrypted document and the encrypted symmetric key are sent to the recipient. What is the primary advantage of this hybrid approach over encrypting the entire document with RSA?

   • AIt allows the sender to decrypt the document after sending it.
   • BIt reduces the computational overhead for encrypting large documents.
   • CIt eliminates the need to manage the recipient's public key.
   • DIt makes the document immune to quantum attacks.
   Reveal Solution Discussion Select an answer first