简单替代密码
简单的替代密码详细操作教程
简单替换密码是最常用的密码，它包括用每个明文字符替换每个密文字符的算法。在此过程中，与Caesar密码算法相比，字母混乱了。
示例
简单替换密码的密钥通常由26个字母组成。一个示例键是-
# Filename : example.py
# Copyright : 2020 By Lidihuo
# Author by : www.lidihuo.com
# Date : 2020-08-28
plain alphabet : abcdefghijklmnopqrstuvwxyz
cipher alphabet: phqgiumeaylnofdxjkrcvstzwb
使用上述密钥进行加密的示例是-
# Filename : example.py
# Copyright : 2020 By Lidihuo
# Author by : www.lidihuo.com
# Date : 2020-08-28
plaintext : defend the east wall of the castle
ciphertext: giuifg cei iprc tpnn du cei qprcni
以下代码显示了实现简单替换密码的程序-
# Filename : example.py
# Copyright : 2020 By Lidihuo
# Author by : www.lidihuo.com
# Date : 2020-08-28
import random, sys
LETTERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
def main():
message = ''
if len(sys.argv) > 1:
with open(sys.argv[1], 'r') as f:
message = f.read()
else:
message = raw_input("Enter your message: ")
mode = raw_input("E for Encrypt, D for Decrypt: ")
key = ''
while checkKey(key) is False:
key = raw_input("Enter 26 ALPHA key (leave blank for random key): ")
if key == '':
key = getRandomKey()
if checkKey(key) is False:
print('There is an error in the key or symbol set.')
translated = translateMessage(message, key, mode)
print('Using key: %s' % (key))
if len(sys.argv) > 1:
fileOut = 'enc.' + sys.argv[1]
with open(fileOut, 'w') as f:
f.write(translated)
print('Success! File written to: %s' % (fileOut))
else: print('Result: ' + translated)
# Store the key into list, sort it, convert back, compare to alphabet.
def checkKey(key):
keyString = ''.join(sorted(list(key)))
return keyString == LETTERS
def translateMessage(message, key, mode):
translated = ''
charsA = LETTERS
charsB = key
# if decrypt mode is detected, swap A and B
if mode == 'D':
charsA, charsB = charsB, charsA
for symbol in message:
if symbol.upper() in charsA:
symIndex = charsA.find(symbol.upper())
if symbol.isupper():
translated += charsB[symIndex].upper()
else:
translated += charsB[symIndex].lower()
else:
translated += symbol
return translated
def getRandomKey():
randomList = list(LETTERS)
random.shuffle(randomList)
return ''.join(randomList)
if __name__ == '__main__':
main()
输出
实现上面给出的代码时，您可以观察到以下输出-
