Exam2 - CIS 3362 Exam#2(Chapters 5-7 Date Name 1(5 pts...

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CIS 3362 Exam #2 (Chapters 5-7) Date: 10/31/06 Name: ________________________________ 1) (5 pts) Using the Permutation cipher as described in the text on page 87, encrypt the plaintext TODAYSHALLOWEEN using the encryption keys d = 5 and f = {3, 5, 2, 1, 4}. __________________________ 2) (10 pts) Encrypt the plaintext DOUBL ETRAN SPOSI TIONI SDOUB LETRO UBLEX using the double transposition cipher. Use LAKES as your first keyword and OCEAN as your second keyword. Use may use the grids provided below: _______________________________________________________________________ _ 3) (10 pts) It is known that the output of S-box S6 is 13. What were the four possible inputs that could have produced this output? (Please list your answers as 6-bit strings.) ____________ , ____________ , ____________ , ____________
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4) (20 pts) Find the polynomial of one four-element LFSR that has a maximal cycle. (Note: There are several correct answers to this question. In order to receive full-credit, you must have proof that the LFSR described produces a maximal cycle.)
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Exam2 - CIS 3362 Exam#2(Chapters 5-7 Date Name 1(5 pts...

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