A method for securing data flows in a communication device configurable from a remote terminal, the method comprising steps of recording a first encryption key in a memory of the device, the generation, from the first key, of a public key and of a private key corresponding to the public key, the reception of a request for securing sent by the remote terminal and a sending of the public key to the remote terminal in response to the request for securing, the operations of receiving the request and of sending the public key being performed when the device and the terminal are connected to the same local network. Another object of the invention is a communication device configured to implement the method described.