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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 2006
Keywords:
  • Authenticates
  • Authentication
  • Particularly
  • Either...or
  • Environment
  • The Environment
  • Permutation
  • The Internet
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Sample Document Text

CMSC 414 F06 Exam 1 Page 1 of 6 Name:_________________________ _____________________________________________________________________________________ Total points: 40. Total time: 75 minutes. 6 problems over 6 pages. No book, notes, or calculator 1. [14 points] Are n=187 and e=9 valid numbers for RSA. Explain. If you answer yes, obtain the corresponding d. CMSC 414 F06 Exam 1 Page 2 of 6 Name:_________________________ 2. [6 points] Consider a sensor X that periodically sends a 64-octet measurement to a receiver Y. One day the administrator decides that X should encrypt the measurement data using DES in CBC mode. How many octets does X now send for each measurement? Explain your answer. CMSC 414 F06 Exam 1 Page 3 of 6 Name:_________________________ 3. [8 points] Lish, Pish, and Kish are three languages like English, except that each of them has an alphabet of 4 characters, namely, "A", "B", "C", and "D". The frequency (as percentage) of letter usage in ...

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