Cryptographic Techniques and Algorithms NDE Practice Questions (Page 8)

Questions 36–39

1. 36foundation · easy

   Which statement correctly describes symmetric encryption?

   • AIt uses a key that is derived from the data being encrypted.
   • BIt uses the same key for both encryption and decryption.
   • CIt uses a different key for each block of data.
   • DIt uses a pair of keys: one public and one private.
   Reveal Solution Discussion Select an answer first
2. 37application · easy

   A security administrator needs to verify that a downloaded firmware file has not been tampered with during transit. The vendor provides a checksum on their website. Which action should the administrator take?

   • ADecrypt the file with the vendor's public key and check that it opens correctly.
   • BUse the vendor's private key to encrypt the file and compare the result to the checksum.
   • CRun a brute-force attack on the checksum to recover the original file and compare it.
   • DCompute the SHA-256 hash of the downloaded file and compare it to the vendor's published checksum.
   Reveal Solution Discussion Select an answer first
4. 38foundation · easy

   Which of the following is a common hash function used for data integrity?

   • ASHA-256
   • BAES
   • CRSA
   • DDiffie-Hellman
   Reveal Solution Discussion Select an answer first
5. 39foundation · easy

   Which process is used to create a digital signature?

   • AHashing the message and appending the hash in plaintext
   • BEncrypting the entire message with the recipient's public key
   • CEncrypting a hash of the message with the sender's private key
   • DEncrypting the message with a shared symmetric key
   Reveal Solution Discussion Select an answer first