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Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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5, Which description about the AES cipher is NOT correct?  

  1. AES is more secure than the DES cipher.
  2. The block size of AES is 64 bits.
  3. The AES cipher transforms the internal state during encryption.
  4. AES supports multiple key length options.

 

 

6, Which description about the block cipher operational modes is NOT correct? 

  1. A block cipher in ECB mode generates identical ciphertext blocks for identical plaintext blocks.
  2. A block cipher in CBC mode can encrypt each block in parallel.
  3. In CBC mode, an error in a ciphertext block can affect the decrypted plaintext of the next ciphertext block.
  4. Both the OFB and CFB modes transform block ciphers to stream ciphers.

 

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