Python - Cifrado de clave publica libro stallings-william-comunicaciones-y-redes-de-computadores hoja 624

# Soy principiante , lo hice por que estoy aprendiendo .No me critiquen :( 

import random

import math

def Rsa():

    Mensaje = input("Ingresa Palabra: ")

    Mensaje2 = ""

    M_N = []

    C = []

    M_N2 = []

    for n in Mensaje:

        M_N.append(ord(n))

    print("M_N = ", M_N)

    Num_Pri = [1087,1091,1093,1097,1103,1109,1117,1123,1129,1151,1153,1163,1171,1181,1187,1193,1201,1213,1217,1223,1229,1231,1237,1249,

            1259,1277,1279,1283,1289,1291,1297,1301,1303,1307,1319,1321,1327,1361,1367,1373,1381,1399,1409,1423,1427,1429,

            1433,1439,1447,1451,1453,1459,1471,1481,1483,1487,1489,1493,1499,1511,1523,1531,1543,1549,1553,1559,1567,1571,

            1579,1583,1597,1601,1607,1609,1613,1619,1621,1627,1637,1657,1663,1667,1669,1693,1697,1699,1709,1721,1723,1733,

            1741,1747,1753,1759,1777,1783,1787,1789,1801,1811,1823,1831,1847,1861,1867,1871,1873,1877,1879,1889,1901,1907,1913,

            1931,1933,1949,1951,1973,1979,1987,1993,1997,1999,2003,2011,2017,2027,2029,2039,2053,2063,2069,2081,

            2083,2087,2089,2099,2111,2113,2129,2131,2137,2141,2143,2153,2161,2179,2203,2207,2213,2221,2237,2239,

            2243,2251,2267,2269,2273,2281,2287,2293,2297,2309,2311,2333,2339,2341,2347,2351,2357,2371,2377,

            2381,2383,2389,2393,2399,2411,2417,2423,2437,2441,2447,2459,2467,2473,2477,2503,2521,2531,

            2539,2543,2549,2551,2557,2579,2591,2593,2609,2617,2621,2633,2647,2657,2659,2663,2671,2677,

            2683,2687,2689,2693,2699,2707,2711,2713,2719,2729,2731,2741,2749,2753,2767,2777,2789,2791,2797,

            2801,2803,2819,2833,2837,2843,2851,2857,2861,2879,2887,2897,2903,2909,2917,2927,2939,2953,

            2957,2963,2969,2971,2999,3001,3011,3019,3023,3037,3041,3049,3061,3067,3079,3083,3089,3109,3119,

            3121,3137,3163,3167,3169,3181,3187,3191,3203,3209,3217,3221,3229,3251,3253,3257,3259,3271,3299,3301,

            3307,3313,3319,3323,3329,3331,3343,3347,3359,3361,3371,3373,3389,3391,3407,3413,3433,3449,3457,

            3461,3463,3467,3469,3491,3499,3511,3517,3527,3529,3533,3539,3541,3547,3557,3559,3571,3581,3583,

            3593,3607,3613,3617,3623,3631,3637,3643,3659,3671,3673,3677,3691,3697,3701,3709,3719,3727,3733,

            3739,3761,3767,3769,3779,3793,3797,3803,3821,3823,3833,3847,3851,3853,3863,3877,3881,3889,

            3907,3911,3917,3919,3923,3929,3931,3943,3947,3967,3989,4001,4003,4007,4013,4019,4021,4027,4049,

            4051,4057,4073,4079,4091,4093,4099,4111,4127,4129,4133,4139,4153,4157,4159,4177,4201,4211,4217,4219,

            4229]

    p = Num_Pri[random.randint(1,len(Num_Pri))]

    q = Num_Pri[random.randint(1,len(Num_Pri))]

    n = p * q

    phi = (p-1) * (q-1)

    e = 0

    d = 0

    for i in range(2,phi+1):

        if math.gcd(phi,i) == 1:

            e = i

            break

    for i in range(1,phi+1):

        if ((i * e)-1) % phi == 0:

            d = i

            break

    for i in M_N:

        C.append(i ** e % n)

    for i in C:

        M_N2.append(i ** d % n)

    for i in M_N2:

        Mensaje2 = Mensaje2 + chr(i)

    print("Mensaje =", Mensaje)

    print ("p = ", p)

    print ("q =", q)

    print("n = ", n)

    print("phi = ", phi)

    print("E =", e)

    print("d =", d)

    print("C =", C)

    print("M_N =",M_N)

    print("M_N2 =", M_N2)

    print("Mensaje =", Mensaje2)