In ascii, the letters a, b, c, . . , z are represented by the integers 65, 66, 67, . . , 90, respectively. convert the word talk into a bit stream by converting each letter into an integer, converting each integer into a binary (base 2) string of seven bits, and then concatenating the binary strings. (b) give the rst eight bits produced by the lfsr with the rule xn = + and initial cell contents x0 = 1, x1 = 0, and x2 = 1. what is its period? (c) encipher talk using this lfsr.