Implement the modular exponentiation (a.k.a. fast exponentiation) function mod_exp (b, n, m) to compute bn (mod m) more efficiently. (Hint: to read n bit-by-bit, use / and % operations repeatedly) a) Test your function for b = 3, n = 231 – 2, m = 231 – 1. b) Report the result and the time (in seconds) it takes to find the result.

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