python实现凯撒密码加解密

源代码

def CaesarEncode(PlainText,shif):    #加密
TextList = []
AsciiList = []
ResultList = []
shift = int(shif)
for i in PlainText:
TextList.append(i)
for j in TextList:
num = ord(j)
AsciiList.append(num)
for k in AsciiList:
tmp = int(k)
addnum = tmp + shift
Str = chr(addnum)
ResultList.append(Str)
ResultStr = "".join(ResultList)
return ResultStr

def CaesarDecode(CipherText,shif):     #解密
NumList = []
StrList = []
shift = int(shif)
for i in CipherText:
Num = ord(i)
NumList.append(Num)
for d in NumList:
j = int(d)
if(j - shift < 97):
num = j - shift + 26
StrList.append(chr(num))
else:
if(j - shift > 123):
num = j - shift - 26
StrList.append(chr(num))
else:
num = j - shift
StrList.append(chr(num))

PlainText = "".join(StrList)
return PlainText

其实还可以继续优化一下
就是在解密时将26种情况同时列出来
大家可以下去自己试试哦

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