Python实现的文本简单可逆加密算法示例

 # -*-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