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Question: 1 given the 8bit twos complement numbers a 0110...

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1) Given the 8-bit two’s complement numbers A = 0110 1000, and B = 0101 1010, compute –B in two’s complement, and then compute A – B by adding A and –B in two’s complement. Answer all the following: Determine: –B = Compute: A – B = Is there an overflow, and why? What is the value of the answer in decimal?

2) Compute the value of the following modular expression using modulo reduction. Your answer must be a specific mod 17 number, not a formula or expression of any kind. Show your work. 323 mod 17 =

3) Encrypt the message: “blankspace” using the Vigenère cipher with the key DANGER. Plaintext alphabet:

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

a b c d e f g h i j k l m n o p q r s t u v w x y z

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