414-e1-F06 - CMSC 414 F06 Exam 1 Page 1 of 6...

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Unformatted text preview: 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 these languages is as follows:...
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This note was uploaded on 03/22/2012 for the course CSE 5345 taught by Professor Youngheliu during the Spring '12 term at UT Arlington.

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414-e1-F06 - CMSC 414 F06 Exam 1 Page 1 of 6...

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