使用python实现简单的加密解密机制

# -*- 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
= list0
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()