Patent ID: 11895487
Assignee: ORANGE
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A determining method for determining a key to secure a communication between a user equipment and an application server, said method comprising:
the user equipment authenticating with an authentication server of a mobile communication network, a secret master key being generated, during said authenticating, by the user equipment and the authentication server;
after the secret master key is generated by the user equipment and the authentication server, sending by the user equipment to the authentication server, a key request with a view to communicating with the application server; and
computing said key by using a key derivation function applied to at least a random variable, a user identifier and an identifier of the application server and using the master key, said random variable having been received by the user equipment from the authentication server after sending the key request to the authentication server.