#!/usr/bin/env python 
def range_prime(start, end): 
l = list() 
for i in range(start, end+1): 
flag = True 
for j in range(2, i): 
if i % j == 0: 
flag = False 
break 
if flag: 
l.append(i) 
return l 
def generate_keys(p, q): 
#numbers = (11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47) 
numbers =range_prime(10, 100) 
N = p * q 
C = (p-1) * (q-1) 
e = 0 
for n in numbers: 
if n < C and C % n > 0: 
e = n 
break 
if e==0: 
raise StandardError("e not found") 
d = 0 
for n in range(2, C): 
if(e * n) % C == 1: 
d = n 
break 
if d==0: 
raise StandardError("d not found") 
return ((N, e), (N, d)) 
def encrypt(m, key): 
C, x = key 
return (m ** x) % C 
decrypt = encrypt 
if __name__ == '__main__': 
pub, pri = generate_keys(47, 79) 
L = range(20, 30) 
C = map(lambda x: encrypt(x, pub), L) 
D = map(lambda x: decrypt(x, pri), C) 
print "keys:", pub, pri 
print "message:", L 
print "encrypt:", C 
print "decrypt:", D 
keys: (3713, 11) (3713, 1631) 
message: [20, 21, 22, 23, 24, 25, 26, 27, 28, 29] 
encrypt: [406, 3622, 3168, 134, 3532, 263, 1313, 2743, 2603, 1025] 
decrypt: [20L, 21L, 22L, 23L, 24L, 25L, 26L, 27L, 28L, 29L]