一、非对称加密和RSA

1.非对称秘钥

https://blog.csdn.net/gao131360144/article/details/79966094

HTTPS：SSH、数字指纹、数字签名SHA、RSA非对称加密、AES对称加密

2.RSA加密的核心

https://blog.csdn.net/qq_45616828/article/details/127702311

3.Python中实现RSA加密解密

import rsa
from binascii import b2a_hex, a2b_hex# 第一步：生成RSA公钥和私钥
# pub, priv = rsa.newkeys(256)
pub, priv = rsa.newkeys(2048)
print(pub, priv)# 第二步：公钥加密
encrypt = rsa.encrypt('Hello-蜗牛'.encode(), pub)
print(encrypt)
encstr = b2a_hex(encrypt).decode()
print(encstr)# 第三步：私钥解密
# decrypt = rsa.decrypt(encrypt, priv)
decrypt = rsa.decrypt(a2b_hex(encstr), priv)
print(decrypt.decode())

二、HTTPS通信过程

三、对称加密和AES

1.AES简介

2.Python中实现AES加解密

加密过程

from Crypto.Cipher import AES
from binascii import b2a_hex, a2b_hex# 加密过程
source = 'Hello-蜗牛难道不是吗也许'# 如果source分组后剩余长度不足16位的倍数就用空格补足为16位
if len(source.encode('utf-8')) % 16:add = 16 - (len(source.encode('utf-8')) % 16)
else:add = 0
source = source + ('\0' * add)
print(source)# 定义密钥和偏移量，必须是16个字节、24字节或32字节
# key = 'todayiswonderful-1234567'.encode()
key = 'todayiswonderful-FEDCBA987654321'.encode()
mode = AES.MODE_CBC
iv = b'1234567890ABCDEF'
cryptos = AES.new(key, mode, iv)cipher = cryptos.encrypt(source.encode())
print(cipher)
print(b2a_hex(cipher).decode())

解密过程

from Crypto.Cipher import AES
from binascii import b2a_hex, a2b_hex
# 解密
source = 'f0c0ba97df33f91fdbfacd99c38838f347831e7e3a1f893f6752cdd080fc1c83cb300c0b7e117d587d7e5a69dbb70aee'key = 'todayiswonderful-FEDCBA987654321'.encode()
mode = AES.MODE_CBC
iv = b'1234567890ABCDEF'
cryptos = AES.new(key, mode, iv)dest = cryptos.decrypt(a2b_hex(source))
print(dest.decode().rstrip('\0'))