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Unformatted text preview: n = 143 and the enciphering exponent is e = 103 , where n = 143 = 11 13 . (a) Compute the deciphering exponent d. (b) Assume that the following letter to number translation table is used: J = 1 ,Q = 2 ,R = 3 ,L = 4 ,D = 5 ,A = 6 ,S = 7 ,Y = 8 ,T = 9 ,O = 0 Encrypt the message SO. (c) Assume that a message has been grouped into blocks of two letters, enciphered and send out as 10 03 . Decipher the message. 5. Let C be a binary code with generator matrix 1 1 1 1 1 1 1 1 1 (a) Find the Partity check matrix of C . (b) Find all of the codewords of C (c) How many redundant digits are there in a codeword? (d) What is the minimum distance d of C ? (e) How many errors can it detect? How many errors can it correct? (f) Use this coding to encode 101....
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 Spring '08
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 Math, Algebra

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