plaintext
Data sent without encryption, readable by anyone on the path.
Plaintext traffic can be read and altered by anyone on the network path -- the Wi-Fi, the router, the ISP -- including credentials and commands.
Examples
Over plain HTTP, a stranger on the same Wi-Fi reads the token
7f3a9cin theAuthorizationheader and can reuse it.A plaintext
PUTsetting the valve to 40 percent can be altered on the way to 100 percent.
See also