The invention relates to a method for securing a request for executing a first application (P1) in a first device (11) of a secured environment, by a second application (P2) located in a second device (10), said method including the following steps: receiving a first request to execute the first application, from the second application; generating a random number and a session key that is dependent on the random number, sending said random number to a trusted entity (12), said random number being intended for enabling the trusted entity to generate the session key, receiving a second request for executing the first application, from a third application (P3) generated by the trusted entity and transmitted to the second device, said third application including the session key, authenticating the third application by means of the session key, said authentication being the condition for the execution of the first application.