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Past Exam for CMSC 414 - CMPTR & NETWORK SECURITY at Maryland (UMD)

Exam Information

Material Type:Exam 1
Professor:Staff
Class:CMSC 414 - CMPTR & NETWORK SECURITY
Subject:Computer Science
University:University of Maryland
Term:Fall 2007
Keywords:
  • Particularly
  • Authentication
  • Total Number
  • Destination
  • Environment
  • The Environment
  • Infrastructure
  • Following Terms
  • The Internet
  • The Message
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Sample Document Text

CMSC 414 F07 Exam 1 Page 1 of 7 Name:_________________________ _____________________________________________________________________________________ Total points: 60. Total time: 75 minutes. 6 problems over 7 pages. No book, notes, or calculator 1. [14 points] Are n=323 and e=5 valid numbers for RSA. Explain. If you answer yes, obtain the corresponding d. CMSC 414 F07 Exam 1 Page 2 of 7 Name:_________________________ 2. [5 points] Recall that a DES encryption operation takes a 64-bit plaintext block and a 56-bit key and produces a 64-bit ciphertext block. Recall also that each DES encryption operation itself consists of a number of iterations, which we shall refer to as basic iterations. For the DES encryption in CBC mode of a plaintext message of N 64-bit blocks, obtain the following (in terms of N): a. Total number of DES encryption operations. b. Size of the output. Explain briefly. c. Total number of basic iterations. Explain briefly. CMSC 414 F07 ...

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