Python密碼學(xué)仿射密碼及攻擊單字母密碼教程

更新時(shí)間：2022年05月24日 10:19:31 作者：菜鳥教程

這篇文章主要為大家介紹了Python密碼學(xué)仿射及攻擊單字母密碼教程，有需要的朋友可以借鑒參考下，希望能夠有所幫助，祝大家多多進(jìn)步，早日升職加薪

仿射密碼

Affine Cipher是Multiplicative Cipher和Caesar Cipher算法的組合.

仿射密碼的基本實(shí)現(xiàn)如下圖所示 :

我們將通過創(chuàng)建包含兩個(gè)加密和解密基本函數(shù)的相應(yīng)類來實(shí)現(xiàn)仿射密碼.

代碼

您可以使用以下代碼實(shí)現(xiàn)仿射密碼 :

?class仿射(對象):
?DIE?=?128?
?KEY?=(7,3,55)
?def?__init?__(self):
#傳遞
?def?encryptChar(self，char):
?K1，K2，?kI?=?self.KEY?
?return?chr((K1?*?ord(char)+?K2)%self.DIE)
?def?encrypt(self，string):
?return""?.join(map(self.encryptChar，string))
?def?decryptChar(self，char):
?K1，K2，KI?=?self.KEY?
?return?chr(KI?*?(ord(char)?-??K2)%self.DIE)
?def?decrypt(self，string):
?return"".join(map(self.decryptChar，string))
?affine?=?Affine()
?print?affine.encrypt('?Affine?Cipher')
?print?affine.decrypt('*?18？FMT')

輸出

實(shí)現(xiàn)仿射密碼時(shí)，可以觀察到以下輸出;

輸出顯示純文本消息仿射密碼的加密消息和已作為輸入 abcdefg發(fā)送的消息的解密消息.

單字母密碼

接下來，您將學(xué)習(xí)使用Python的單字母密碼及其黑客攻擊.

單字母密碼使用固定替換用于加密整個(gè)消息.這里顯示使用帶有JSON對象的Python字典的單字母密碼 :

monoalpha_cipher?=?{
???'a':?'m',
???'b':?'n',
???'c':?'b',
???'d':?'v',
???'e':?'c',
???'f':?'x',
???'g':?'z',
???'h':?'a',
???'i':?'s',
???'j':?'d',
???'k':?'f',
???'l':?'g',
???'m':?'h',
???'n':?'j',
???'o':?'k',
???'p':?'l',
???'q':?'p',
???'r':?'o',
???'s':?'i',
???'t':?'u',
???'u':?'y',
???'v':?'t',
???'w':?'r',
???'x':?'e',
???'y':?'w',
???'z':?'q',
'?':?'?',
}

借助此詞典，我們可以使用相關(guān)字母加密字母為JSON對象中的值.

以下程序創(chuàng)建一個(gè)單字母程序作為類表示，其中包括加密和解密的所有功能.

from?string?import?letters,?digits
from?random?import?shuffle
def?random_monoalpha_cipher(pool?=?None):
???if?pool?is?None:
??????pool?=?letters?+?digits
???original_pool?=?list(pool)
???shuffled_pool?=?list(pool)
???shuffle(shuffled_pool)
???return?dict(zip(original_pool,?shuffled_pool))
def?inverse_monoalpha_cipher(monoalpha_cipher):
???inverse_monoalpha?=?{}
???for?key,?value?in?monoalpha_cipher.iteritems():
??????inverse_monoalpha[value]?=?key
???return?inverse_monoalpha
def?encrypt_with_monoalpha(message,?monoalpha_cipher):
???encrypted_message?=?[]
???for?letter?in?message:
??????encrypted_message.append(monoalpha_cipher.get(letter,?letter))
???return?''.join(encrypted_message)
def?decrypt_with_monoalpha(encrypted_message,?monoalpha_cipher):
???return?encrypt_with_monoalpha(
??????encrypted_message,
??????inverse_monoalpha_cipher(monoalpha_cipher)
???)

稍后調(diào)用此文件以實(shí)現(xiàn)Monoalphabetic密碼的加密和解密過程，如下所示 :

import?monoalphabeticCipher?as?mc
cipher?=?mc.random_monoalpha_cipher()
print(cipher)
encrypted?=?mc.encrypt_with_monoalpha('Hello?all?you?hackers?out?there!',?cipher)
decrypted?=?mc.decrypt_with_monoalpha('sXGGt?SGG?Nt0?HSrLXFC?t0U?UHXFX!',?cipher)
print(encrypted)
print(decrypted)