![]() Privacy: data is encrypted using symmetric cryptography, and cannot be read by a man-in-the-middle.The Transport Layer Security (TLS) protocol sits on top of TCP, and provides one or more of: This information is transmitted in plaintext, which we (and anyone else) can see by capturing network traffic in Wireshark: ![]() We can test this inside a telnet session: ➜ ~ telnet 127.0.0.1 56789 0.000s accept () handle_connection ( conn ) run_server () encode ( "utf-8" )) def run_server (): with socket. recv ( 1024 ) if not data : # Empty response means disconnected (TCP messages have at least one byte)īreak data = data. Let’s build a toy service that listens on a socket, and echoes back whatever text it receives, but uppercased: import socket host = "127.0.0.1" port = 56789 def handle_connection ( conn ): while True : data = conn. Motivating example: network messages are plaintext Today I explore what this looks like in Python. Although we usually hear about SSL/TLS in the context of securing HTTP traffic, it can actually be used to secure any socket connection.
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