python字符串加密解密的三种方法分享(base64 win32com)

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