1 #Reverse Cipher
2 message = ‘there can keep a secret,if two of them are dead.‘
3 translated = ‘‘
4 i = len(message)-1
5 while i >= 0:
6     translated = translated + message[i]
7     i = i-1
8 print  translated

>>>C:\Python27\python.exe E:/Python/密码学编程/5.py
.daed era meht fo owt fi,terces a peek nac ereht

Process finished with exit code 0