python加密解密字符串_[Python] 字符串加密解密

1. 最简单的方法是用base64:

import base64

s1 = base64.encodestring('hello world')

s2 = base64.decodestring(s1)

print s1,s2

# aGVsbG8gd29ybGQ=\n

# hello world

Note: 这是最简单的方法了，但是不够保险，因为如果别人拿到你的密文，也可以自己解密来得到明文

2. 第二种方法是使用win32com.client

import win32com.client

def encrypt(key,content): # key:密钥,content:明文

EncryptedData = win32com.client.Dispatch('CAPICOM.EncryptedData')

EncryptedData.Algorithm.KeyLength = 5

EncryptedData.Algorithm.Name = 2

EncryptedData.SetSecret(key)

EncryptedData.Content = content

return EncryptedData.Encrypt()

def decrypt(key,content): # key:密钥,content:密文

EncryptedData = win32com.client.Dispatch('CAPICOM.EncryptedData')

EncryptedData.Algorithm.KeyLength = 5

EncryptedData.Algorithm.Name = 2

EncryptedData.SetSecret(key)

EncryptedData.Decrypt(content)

str = EncryptedData.Content

return str

s1 = encrypt('lovebread', 'hello world')

s2 = decrypt('lovebread', s1)

print s1,s2

# MGEGCSsGAQQBgjdYA6BUMFIGCisGAQQBgjdYAwGgRDBCAgMCAAECAmYBAgFABAgq

# GpllWj9cswQQh/fnBUZ6ijwKDTH9DLZmBgQYmfaZ3VFyS/lq391oDtjlcRFGnXpx

# lG7o

# hello world

Note: 这种方法也很方便，而且可以设置自己的密钥，比第一种方法更加安全，是加密解密的首选之策！

3. 还有就是自己写加密解密算法，比如:

def encrypt(key, s):

b = bytearray(str(s).encode("gbk"))

n = len(b) # 求出 b 的字节数

c = bytearray(n*2)

j = 0

for i in range(0, n):

b1 = b[i]

b2 = b1 ^ key # b1 = b2^ key

c1 = b2 % 16

c2 = b2 // 16 # b2 = c2*16 + c1

c1 = c1 + 65

c2 = c2 + 65 # c1,c2都是0~15之间的数,加上65就变成了A-P 的字符的编码

c[j] = c1

c[j+1] = c2

j = j+2

return c.decode("gbk")

def decrypt(key, s):

c = bytearray(str(s).encode("gbk"))

n = len(c) # 计算 b 的字节数

if n % 2 != 0 :

return ""

n = n // 2

b = bytearray(n)

j = 0

for i in range(0, n):

c1 = c[j]

c2 = c[j+1]

j = j+2

c1 = c1 - 65

c2 = c2 - 65

b2 = c2*16 + c1

b1 = b2^ key

b[i]= b1

try:

return b.decode("gbk")

except:

return "failed"

key = 15

s1 = encrypt(key, 'hello world')

s2 = decrypt(key, s1)

print s1,'\n',s2

# HGKGDGDGAGPCIHAGNHDGLG

# hello world