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使用python实现rsa算法代码

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WBOYOriginal
2016-06-10 15:06:051549browse

RSA算法是一种非对称加密算法,是现在广泛使用的公钥加密算法,主要应用是加密信息和数字签名。

维基百科给出的RSA算法简介如下:

假设Alice想要通过一个不可靠的媒体接收Bob的一条私人讯息。她可以用以下的方式来产生一个公钥和一个私钥:

随意选择两个大的质数p和q,p不等于q,计算N=pq。

根据欧拉函数,不大于N且与N互质的整数个数为(p-1)(q-1)

选择一个整数e与(p-1)(q-1)互质,并且e小于(p-1)(q-1)

用以下这个公式计算d:d × e ≡ 1 (mod (p-1)(q-1))

将p和q的记录销毁。

(N,e)是公钥,(N,d)是私钥。(N,d)是秘密的。Alice将她的公钥(N,e)传给Bob,而将她的私钥(N,d)藏起来。

#!/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] 

以上所述是小编给大家介绍的使用python实现rsa算法代码,希望对大家有所帮助!

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