python实现的Caesar加解密算法，pythoncaesar,Caesar算法是最简单

python实现的Caesar加解密算法，pythoncaesar,Caesar算法是最简单

Caesar算法是最简单的加解密算法...

    # Caeser Cipher      import sys,os      MyCypher = 25      MyDict = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz `1234567890-=~!@#$%^&amp;*()_+[]\\;\',./{}|:"<>?'      plaintext = 'Hello World!'      cryptmsg = ''      def encrypt(text, cypher):          out_text = ''          for e in text:              x = e              if (e in MyDict):                  idx = MyDict.find(e)                  idx = idx + cypher                  idx = idx % len(MyDict)                  x = MyDict[idx]              out_text = "%s%c" % (out_text, x)          return out_text      def decrypt(msg, cypher):          out_text = ''          for e in msg:              x = e              if (e in MyDict):                  idx = MyDict.find(e)                  idx = idx - cypher + len(MyDict)                  idx = idx % len(MyDict)                  x = MyDict[idx]              out_text = "%s%c" % (out_text, x)          return out_text      def ask_cypher():          user_input = raw_input('Input Cypher: ')          return long(user_input)      def ask_text():          user_input = raw_input('Input Text: ')          return user_input      def ask_action():          print '-----------------------'          print '0 - Exit'          print '1 - Encrypt'          print '2 - Decrypt'          print '-----------------------'          user_input = raw_input('Select You Action: ')          if user_input in ['0', '1', '2']:              if user_input == '0':                  return 'exit'              elif user_input == '1':                  return 'enc'              elif user_input == '2':                  return 'dec'          else:              return 'exit'      # ---------------------------------------------------------------      # Program Start Here      # ---------------------------------------------------------------      MyCypher = ask_cypher()      print 'Cypher: %d' % MyCypher      for i in range(0, 100):          action = ask_action()          if action == 'dec':              cryptmsg = ask_text()              print decrypt(cryptmsg, MyCypher)          elif action == 'enc':              plaintext = ask_text()              print encrypt(plaintext, MyCypher)          else:              print 'Exit!'              break  

执行后,输入密码(数字),然后选择动作,最后输入密文或原文,就能得到原文或密文了.