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Consider the following encryption functions, which of them is/are valid, which is/are not? Justify your answers. a) P = C = K = Z51, Ek(x)
Consider the following encryption functions, which of them is/are valid, which is/are not? Justify your answers.
a) P = C = K = Z51, Ek(x) = (17x + 10) mod 51, Dk(y) = (17y + 41) mod 51
b) P = C = K = Z26, Ek(x) = (7x + 3) mod 26, Dk(y) = (15y + 17) mod 26
c) P = C = K = Z26, Ek(x) = x mod 26, Dk(y) = y mod 26
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