使用python实现简单的加密解密机制

          很久没写博客了，这次使用python实现一个简单的加密解密机制。

描述：结合26个字母、以一个单词作为秘钥，使用python实现简单的加密解密机制

秘钥：大写的英文字符串

明文：包含空格、大小写字母、数字等的字符串

代码实现：

# -*- coding: utf-8 -*-
import os,sys  
reload(sys)  
sys.setdefaultencoding('utf8') 
import string

def suanfa(key):
    alp = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
    jiami_key = {}
    jiemi_key = {}

    list0 = list(alp)
    list1 = list(key)
    list2 = list(alp)
    for n in list1:
        for m in list2:
            if m == n:
                list2.remove(m)

    alp1 = ''.join(list2)
    key1 = key + alp1
    list3 = list(key1)

    a = 0
    if a < len(list0):
        for m in list0:
            jiami_key[m] = list3[a]
            a = a + 1
    
    b = 0
    if b < len(list3):
        for n in list3:
            jiemi_key[n] = list0[b]
            b = b + 1
    
    #print jiami_key
    #print jiemi_key
    return jiami_key, jiemi_key  

def bianma(key_dic, data):
    list_data = list(data)
    data1 = []
    for a in list_data:
         if a == ' ':
             data1.append(a)

         elif a.islower():
             a = a.upper()
             if key_dic.has_key(a):
                 x = key_dic[a]
                 data1.append(x.lower())

         elif a.isupper():
             if key_dic.has_key(a):
                 x = key_dic[a]
                 data1.append(x)
         else:
             data1.append(a)

    data2 = ''.join(data1)
    #print data2
    return data2

def main():
    key = 'ZDFKJMNX'
    data = 'a bdcd sFDGDSGFDG113243 3'
    print "秘钥：" + key
    print "明文：" + data

    jiami_key, jiemi_key = suanfa(key)
    miwen = bianma(jiami_key, data)
    mingwen = bianma(jiemi_key, miwen)

    print "加密明文所得的密文：" + miwen
    print "解密密文所得的明文：" + mingwen
    return True

if __name__ == "__main__":
    main() 

运行结果：

# python jiami.py 
秘钥：ZDFKJMNX
明文：a bdcd sFDGDSGFDG113243 3
加密明文所得的密文：z dkfk qMKNKQNMKN113243 3
解密密文所得的明文：a bdcd sFDGDSGFDG113243 3