本文实例讲述了Python实现的文本简单可逆加密算法。分享给大家供大家参考,具体如下:
其实很简单,就是把一段文本每个字符都通过某种方式改变(比如加1)
这样就实现了文本的加密操作,解密就是其逆运算
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# -*-coding:utf-8 -*-
import sys
reload (sys)
sys.setdefaultencoding( 'utf8' )
#加密
def jiami():
filename = raw_input ( 'please input file:\n' )
while True :
try :
password = int ( raw_input ( 'input number pass word:\n' ))
break
except :
print 'please input number:\n'
fileword = open (filename, 'r' )
num = filename.rfind( '.' )
newfilename = filename[:num] + '[加密]' .encode( 'gbk' ) + filename[num:]
content = fileword.read( 1 )
newfileword = open (newfilename, 'a+' )
while len (content)> 0 :
contentInt = ord (content)
newContent = contentInt + password
c = chr (newContent)
newfileword.write(c)
content = fileword.read( 1 )
newfileword.close()
fileword.close()
#解密
def jiemi():
filename = raw_input ( 'please input file:\n' )
while True :
try :
password = int ( raw_input ( 'input number pass word:\n' ))
break
except :
print 'please input number:\n'
fileword = open (filename, 'r' )
num = filename.rfind( '.' )
num2 = filename.rfind( '[' )
newfilename = filename[:num2] + '[解密]' .encode( 'gbk' ) + filename[num:]
content = fileword.read( 1 )
newfileword = open (newfilename, 'a+' )
while len (content)> 0 :
contentInt = ord (content)
newContent = contentInt - password
c = chr (newContent)
newfileword.write(c)
content = fileword.read( 1 )
newfileword.close()
fileword.close()
while True :
index = int ( raw_input ( '---请输入命令,1为加密 2为解密 3为退出---\n' .encode( 'gbk' )))
if index = = 1 :
jiami()
elif index = = 2 :
jiemi()
elif index = = 3 :
exit( 0 )
else :
pass
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注意:
①如果出现中文编码问题可以通过.encode,.decode编码解码
②可以通过Python的切片操作处理文件名,很方便,例如: newfilename=filename[:num]+'[加密]'.encode('gbk')+filename[num:]
③最重要的!!本加密方法只是简单的给文本字符做一个+password处理,其方法非常不合理,因为加的数如果过大会造成chr字节不够(比如你输一个1000)
所以本代码只适用于新手练习,而不能作为真正的处理算法
希望本文所述对大家Python程序设计有所帮助。