python---恺撒加密及破解

凯撒加密—加密算法
在密码学中，恺撒密码是一种最简单且最广为人知的加密技术。它是一种替换加密的技术，
明文中的所有字母都在字母表上向后（或向前）按照一个固定数目进行偏移后被替换成密文。
import string

abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
defghijklmnopqrstuvwxyzabc DEFGHIJKLMNOPQRSTUVWXYZABC

凯撒加密—加密算法的实现
def kaisacrypt(text=’hello’, k=3):
# 对原有小写字母向右移动k位
lower = string.ascii_lowercase[k:] + string.ascii_lowercase[:k]
upper = string.ascii_uppercase[k:] + string.ascii_uppercase[:k]

# 用于创建字符串映射的转换表'hello'
table = str.maketrans(string.ascii_letters, lower+upper)
# 根据转换表去转换对应的字符
return text.translate(table)

def check(text):
“””
思路:
测试文本中是否存在至少两个最常见的英文单词，如果有，则代表破解成功.
“””
mostCommonWords = (‘the’, ‘is’, ‘to’, ‘not’, ‘have’, ‘than’, ‘for’, ‘ok’, ‘and’ )
return len([1 for word in mostCommonWords if word in text])>2

暴力破解
def bruteForce(text):
for i in range(26):
# 1，2，3，4，5
t = kaisacrypt(text, -i)
if check(t):
print(i)
print(t)
break

text = “If not to the sun for smiling, warm is still in the sun there, but wewill laugh more confident calm; if turned to found his own shadow, appropriate escape, the sun will be through the heart,warm each place behind the corner; if an outstretched palm cannot fall butterfly, then clenched waving arms, given power; if I can’t have bright smile, it will face to the sunshine, and sunshine smile together, in full bloom.”
cryptStr = kaisacrypt(text=text, k=18)
print(cryptStr)

bruteForce(cryptStr)
“””
ord(‘a’)
Out[2]: 97
ord(‘d’)
Out[3]: 100
chr(97)
Out[4]: ‘a’
chr(100)
Out[5]: ‘d’
“”“

# I LOVE U
s = ‘I LOVE U’
for i in s:
if i != ”:
print(ord(i), end=’ ‘)

#
life = 287738
end = 9999999999999999999999999999999
love = 999999999999999999999999
while(life < end):
love+=1

import qrcode
img = qrcode.make(‘hello’)
img.save(‘hello.png’)

python---恺撒加密及破解

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