Caesar算法是最简单的加解密算法…
# Caeser Cipherimport sys,osMyCypher = 25MyDict = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz `1234567890-=~!@#$%^&*()_+[]\\;\&;,./{}|:"<>?'plaintext = 'Hello World!'cryptmsg = ''def encrypt(text, cypher):out_text = ''for e in text:x = eif (e in MyDict):idx = MyDict.find(e)idx = idx + cypheridx = idx % len(MyDict)x = MyDict[idx]out_text = "%s%c" % (out_text, x)return out_textdef decrypt(msg, cypher):out_text = ''for e in msg:x = eif (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_textdef ask_cypher():user_input = raw_input('Input Cypher: ')return long(user_input)def ask_text():user_input = raw_input('Input Text: ')return user_inputdef 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' % MyCypherfor 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.
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