Method of sending a data from a secure token to a server

1. A method for managing a response generated by an application embedded in a secure token acting as an UICC in response to a command requesting opening a proactive session, an applicative server relying on an OTA server to send the command to the application, said command being secured by the OTA server with a security layer independent of the content of the command,

wherein said method comprises the steps:

receiving and deciphering the command in the secure token;

the application retrieves the application data from the command and computes a key by applying a preset function to derive the key from said application data;

the application generates the response to the command by executing said command, builds a secured response packet comprising the response secured with the key and sends the secured response packet to the applicative server; and

the applicative server computes the key by applying the preset function to the application data and retrieves the response using the key.

2. The method according to claim 1 , wherein the application generates a key check value of the key and includes the key check value in the secured response packet and wherein the applicative server retrieves the key check value from the secured response packet and verifies the key check value to ensure the integrity and authenticity of the response.

3. The method according to claim 1 , wherein the application sends the secured response packet directly to the applicative server.

4. The method according to claim 1 , wherein the application sends the secured response packet to the applicative server via the OTA server.

5. The method according to claim 1 , wherein the application retrieves the application data from the command by combining bytes individually extracted from the command.

6. A secure token acting as an UICC, comprising:

a processor; and

a memory comprising an application that, when executed by the processor, cause the application to:

receive a command requesting opening a proactive session, said command being initiated by an applicative server and secured by an OTA server with a security layer independent of the content of the command,

retrieve application data from the command,

compute a key by applying a preset function to derive the key from said application data,

generate a response corresponding to the command by executing said command,

build a secured response packet comprising the response secured with the key, and

send the secured response packet to the applicative server to permit the application server to compute the key by applying the preset function to the application data and retrieve the response using the key.

7. The secure token according to claim 6 , wherein the application is configured to generate a key check value of the key and to include the key check value in the secured response packet.

8. The secure token according to claim 6 , wherein the application is configured to send the secured response packet directly to the applicative server.

9. The secure token according to claim 6 , wherein the application is configured to send the secured response packet to the applicative server via the OTA server.

10. The secure token according to claim 6 , wherein the application is configured to retrieve the application data from the command by combining bytes individually extracted from the command.

11. A system, comprising:

an applicative server, and

a secure token acting as an UICC, comprising:

a processor; and

a memory comprising an application that, when executed by the processor, cause the application to:

receive a command requesting opening a proactive session, said command being initiated by the applicative server and secured by an OTA server with a security layer independent of the content of the command,

retrieve application data from the command,

compute a key by applying a preset function to derive the key from said application data,

generate a response corresponding to the command by executing said command,

build a secured response packet comprising the response secured with the key, and

send the secured response packet to the applicative server; and

wherein the applicative server is configured to compute the key by applying the preset function to the application data and to retrieve the response using the key.

12. The system of claim 11 ,

wherein the application is configured to generate a key check value of the key and to include the key check value in the secured response packet, and

wherein the applicative server is configured to compute the key by applying the preset function to the application data, to retrieve the response and the key check value using the key, and to verify said key check value.