Caesar
Python Caesar
恺撒密码是一种替换加密的技术，明文中的所有字母都在字母表上向后（或向前）按照一个固定数目进行偏移后被替换成密文。
Caesar.py
import os
def encryption():
str_raw = input("请输入明文：")
k = int(input("请输入位移值："))
str_change = str_raw.lower()
str_list = list(str_change)
str_list_encry = str_list
i = 0
while i < len(str_list):
if ord(str_list[i]) < 123-k:
str_list_encry[i] = chr(ord(str_list[i]) + k)
else:
str_list_encry[i] = chr(ord(str_list[i]) + k - 26)
i = i+1
print ("加密结果为："+"".join(str_list_encry))
def decryption():
str_raw = input("请输入密文：")
k = int(input("请输入位移值：(-1代表穷举)"))
if k==-1:
print("解密结果为：")
for k in range(1,27):
str_change = str_raw.lower()
str_list = list(str_change)
str_list_decry = str_list
i = 0
while i < len(str_list):
if ord(str_list[i]) >= 97+k:
str_list_decry[i] = chr(ord(str_list[i]) - k)
else:
str_list_decry[i] = chr(ord(str_list[i]) + 26 - k)
i = i+1
print ("".join(str_list_decry))
else:
print("解密结果为：")
str_change = str_raw.lower()
str_list = list(str_change)
str_list_decry = str_list
i = 0
while i < len(str_list):
if ord(str_list[i]) >= 97+k:
str_list_decry[i] = chr(ord(str_list[i]) - k)
else:
str_list_decry[i] = chr(ord(str_list[i]) + 26 - k)
i = i+1
print ("".join(str_list_decry))
def caesar():
print (u"1. 加密")
print (u"2. 解密")
choice = input("请选择：")
if choice == "1":
encryption()
elif choice == "2":
decryption()
else:
print (u"您的输入有误！")
if __name__ == '__main__':
try:
while True:
caesar()
except EOFError:
exit()
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