Cryptography With Python 简明教程
Decryption of Transposition Cipher
在本章中,将学习解密置换密码的程序。
Code
观察以下代码以更好地理解如何解密置换密码。消息 Transposition Cipher 的密文和密钥 6 被获取为 Toners raiCntisippoh. 。
import math, pyperclip
def main():
myMessage= 'Toners raiCntisippoh'
myKey = 6
plaintext = decryptMessage(myKey, myMessage)
print("The plain text is")
print('Transposition Cipher')
def decryptMessage(key, message):
numOfColumns = math.ceil(len(message) / key)
numOfRows = key
numOfShadedBoxes = (numOfColumns * numOfRows) - len(message)
plaintext = float('') * numOfColumns
col = 0
row = 0
for symbol in message:
plaintext[col] += symbol
col += 1
if (col == numOfColumns) or (col == numOfColumns - 1 and row >= numOfRows - numOfShadedBoxes):
col = 0 row += 1 return ''.join(plaintext)
if __name__ == '__main__':
main()