A method for executing by a secure element a command sent by a non-secure processor of a mobile terminal in which the secure element is connected to the non-secure processor, the method comprising steps of: installing in the non-secure processor a customized application module (SLLD) configured for managing a secure communication link with the secure element, transmitting to the secure element first authentication data (APPK, APCT, IIC) for authenticating the customized application module, in an encrypted manner so as to ensure the confidentiality of the first authentication data, the first authentication data comprising a first signature of the executable code of the customized application module, generating and transmitting from the customized application module to the secure element second authentication data (APR, APS, ICKS) for authenticating the customized application module, the second authentication data comprising a second signature of the executable code of the customized application module, calculated by the customized application module, if the secure element determines that the first and second authentication data are consistent with each other, establishing a secure communication link using a communication interface between the non-secure processor and the secure element, the communication link being secure using a session key shared between the customized application module and the secure element, and generated using the first and second authentication data, transmitting a command from the non-secure processor to the secure element, the command being supplied by an application installed in the non-secure processor, and executing the command by the secure element only if the command is sent via the secure communication link. installing in the non-secure processor a customized application module (SLLD) configured for managing a secure communication link with the secure element, transmitting to the secure element first authentication data (APPK, APCT, IIC) for authenticating the customized application module, in an encrypted manner so as to ensure the confidentiality of the first authentication data, the first authentication data comprising a first signature of the executable code of the customized application module, generating and transmitting from the customized application module to the secure element second authentication data (APR, APS, ICKS) for authenticating the customized application module, the second authentication data comprising a second signature of the executable code of the customized application module, calculated by the customized application module, if the secure element determines that the first and second authentication data are consistent with each other, establishing a secure communication link using a communication interface between the non-secure processor and the secure element, the communication link being secure using a session key shared between the customized application module and the secure element, and generated using the first and second authentication data, transmitting a command from the non-secure processor to the secure element, the command being supplied by an application installed in the non-secure processor, and executing the command by the secure element only if the command is sent via the secure communication link.