Method for the security of an electronic operation

1. A method for assisting in improving the security of an electronic operation, said method being implemented by a secure element comprising means for storing instructions for execution of a first application and of a second application that is different from the first application, said method comprising the following successive steps:

selecting the first application;

writing, by the first application, a first piece of data in said means for storing;

selecting the second application;

reading, by the second application, said first piece of data in said means for storing;

verifying, by the second application, that said first piece of data satisfies a predefined condition; and

carrying out, by the second application, said electronic operation which comprises the generating of authentication data from a key stored in said means for storing;

wherein said predefined condition is a time condition.

2. The method according to claim 1 , wherein said predefined condition is that the time interval between the first selecting of the first application and the selecting of the second application is longer than a predetermined duration.

3. The method according to claim 1 , wherein the first selecting of the first application is linked to an electronic operation corresponding to an entry into an entity, and said predefined condition is that said first selecting of the first application was followed over time by a second selecting of the first application which is linked to an electronic operation corresponding to an exit from said entity.

4. The method according to claim 1 , wherein the second application determines a piece of security information and sends said piece of security information to a second electronic device.

5. The method according to claim 1 , wherein selecting the second application is carried out by a contactless communication technology.

6. The method according to claim 5 , wherein the second application forces said electronic operation to be carried out via a communication technology with contact.

7. The method according to claim 5 , wherein the contactless communication technology includes a near field communication technology.

8. The method according to claim 1 , wherein a first memory space of said means for storing corresponds to the first application, a second memory space of said means for storing, different from the first memory space, corresponds to the second application, and when the second application reads said first piece of data during said reading, the second application reads said first piece of data in the first memory space.

9. The method according to claim 8 , wherein the first memory space is a directory file of the first application and the second memory space is a directory file of the second application.

10. The method according to claim 8 , wherein the first application is a first applet, the second application is a second applet, the first memory space is dedicated to the first applet and the second memory space is dedicated to the second applet.

11. The method according to claim 1 , wherein the first application is an application for access to a public transport network.

12. The method according to claim 11 , wherein said writing is triggered by a clocking-in in said public transport network.

13. The method according to claim 12 , wherein said clocking-in results in an opening of an entry gate.

14. The method according to claim 1 , wherein the first application is an identification application.

15. The method according to claim 1 , wherein the second application is an electronic payment application.

16. The method according to claim 15 , wherein the generating of authentication data comprises a determination of a payment cryptogram.

17. The method according to claim 1 , wherein the secure element is included in a chip card or a mobile telephone.