Procedes mis en oeuvre par un dispositif et dans un reseau, entite electronique associee

A method performed in a network comprising an application server, a network server, and a device including a memory storing an application cryptographic key;

• the method comprising the following steps:
• the device testing the memory for the absence or the presence of a cryptographic key associated with the network;
• in the event of the cryptographic key associated with the network being absent, the device sending a request to join the network, the application server producing derivation data, the application server encrypting the derivation data by means of the application cryptographic key, and the device receiving the encrypted derivation data;
• and
• in the event of the cryptographic key associated with the network being present, the device sending a request to join the network, the network server producing derivation data, the network server encrypting the derivation data by means of a network cryptographic key equal to or derived from the cryptographic key associated with the network, and the device receiving the encrypted derivation data.

An electronic entity comprising:

• a memory storing an application cryptographic key;
• a module for sending a request to join a network;
• a mechanism for testing the memory for the absence or the presence of a cryptographic key associated with the network;
• and
• a reception module designed to receive, in the absence of the cryptographic key associated with the network, derivation data produced by an application server and encrypted by means of the application cryptographic key, and, in the presence of the cryptographic key associated with the network, derivation data produced by a server associated with the network and encrypted by means of a network cryptographic key equal to, or derived from, the cryptographic key associated with the network.