python实现移位加密和解密
时间：2021-06-14 09:46:56|栏目：Python代码|点击： 次
本文实例为大家分享了python实现移位加密和解密的具体代码，供大家参考，具体内容如下
代码很简单，就不多做解释啦。主要思路是将字符串转为Ascii码，将大小写字母分别移位密钥表示的位数，然后转回字符串。需要注意的是，当秘钥大于26的时候，我使用循环将其不断减去26，直到密钥等效小于26为止。
def encrypt():
temp = raw_input("Please input your sentence: ")
key = int(raw_input("Please input your key: "))
listA = map(ord,temp)
lens = len(listA)
for i in range(lens):
a = listA[i]
if 65 <= a <= 90:
a += key
while a > 90:
a -= 26
elif 97 <= a <= 122:
a += key
while a > 122:
a -= 26
listA[i] = a
listA = map(chr,listA)
listA = ''.join(listA)
print listA
def unencrypt():
temp = raw_input("Please input your sentence: ")
key = int(raw_input("Please input your key: "))
listA = map(ord, temp)
lens = len(listA)
for i in range(lens):
a = listA[i]
if 65 <= a <= 90:
a -= key
while a < 65:
a += 26
elif 97 <= a <= 122:
a -= key
while a < 97:
a += 26
listA[i] = a
listA = map(chr, listA)
listA = ''.join(listA)
print listA
a = int(raw_input("input 0 to encrypt and 1 to unencrypt"))
if a == 0:
encrypt()
elif a == 1:
unencrypt()
效果
