Python中使用Crypto.Cipher.Blowfish算法加密和解密网络传输数据的步骤

在Python中使用Crypto.Cipher.Blowfish算法加密和解密网络传输数据的步骤如下：

1. 导入所需的模块和函数：

from Crypto.Cipher import Blowfish
from Crypto import Random
from base64 import b64encode, b64decode
import socket

2. 生成随机的密钥和初始向量：

key = b'Sixteen byte key'  # 密钥长度为16字节
iv = Random.new().read(Blowfish.block_size)  # 生成初始向量

3. 创建Blowfish对象并指定密钥和初始向量：

cipher = Blowfish.new(key, Blowfish.MODE_CBC, iv)

4. 创建一个TCP/IP套接字并绑定主机和端口号：

server_address = ('localhost', 8888)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.bind(server_address)

5. 监听端口并接受传入连接：

sock.listen(1)
print("等待连接...")
connection, client_address = sock.accept()
print("已连接：", client_address)

6. 接收数据并解密：

encrypted_data = connection.recv(1024)
decrypted_data = cipher.decrypt(b64decode(encrypted_data)).decode('utf-8')
print("解密后的数据：", decrypted_data)

7. 加密数据并发送：

response = "Hello from server"
encrypted_response = b64encode(cipher.encrypt(response.encode('utf-8')))
connection.sendall(encrypted_response)

8. 关闭连接：

connection.close()

下面是一个完整的例子：

from Crypto.Cipher import Blowfish
from Crypto import Random
from base64 import b64encode, b64decode
import socket

key = b'Sixteen byte key'  # 密钥长度为16字节
iv = Random.new().read(Blowfish.block_size)  # 生成初始向量
cipher = Blowfish.new(key, Blowfish.MODE_CBC, iv)

server_address = ('localhost', 8888)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.bind(server_address)

sock.listen(1)
print("等待连接...")
connection, client_address = sock.accept()
print("已连接：", client_address)

encrypted_data = connection.recv(1024)
decrypted_data = cipher.decrypt(b64decode(encrypted_data)).decode('utf-8')
print("解密后的数据：", decrypted_data)

response = "Hello from server"
encrypted_response = b64encode(cipher.encrypt(response.encode('utf-8')))
connection.sendall(encrypted_response)

connection.close()
sock.close()

在这个例子中，服务器将等待客户端连接并接收加密的数据。然后，它使用Blowfish算法解密数据，并向客户端发送加密的响应。客户端和服务器都使用相同的密钥和初始向量来确保加密和解密正确。