Method for detecting that a secure element has been temporarily disconnected from a device, and corresponding device
A method for detecting that a removable secure element has been temporarily disconnected from a first device includes: Providing by the secure element to the first device a first Temporal Global Identity; Entering the first device in the sleeping mode; If the secure element is inserted and used by a second device during the sleeping mode of the first device, replacing in the secure element the first Temporal Global Identity by a second Temporal Global Identity and providing the second Temporal Global Identity to the second device; When getting out from the sleeping mode by the first device, reading by the first device the Temporal Global Identity stored in the secure element; If the Temporal Global Identity read is not the same than the stored Temporal Global Identity, sending to an MNO server a message to indicate that the secure element has been used by another device.
1. A method for detecting by a first device and by a MNO server that a removable secure element has been temporarily disconnected from said first device, said first device entering during a lap of time in a sleeping mode, said method comprising:
A—Providing by said removable secure element to said first device a Temporal Global Identity, called first Temporal Global Identity, on demand by said first device, before said first device enters in said sleeping mode and storing said first Temporal Global Identity in a memory of said first device;
B—Entering said first device in said sleeping mode;
C—If said removable secure element is inserted and used by a second device, wherein the second device is a different entity from said first device during the sleeping mode of said first device, said use consisting in an action different from a reading of said first Temporal Global Identity, replacing in said removable secure element said first Temporal Global Identity by a second Temporal Global Identity different from said first Temporal Global Identity, providing said second Temporal Global Identity to said second device and storing said second Temporal Global Identity in a memory of said second device;
D—When getting out from said sleeping mode by said first device, reading by said first device the Temporal Global Identity stored in said removable secure element;
E—If the Temporal Global Identity read at step -D- is not identical to the Temporal Global Identity stored at step -A-, sending by said first device to said MNO server a message in order to inform said MNO server that said removable secure element has been used by another device and deregister said first device from network and perform a new registration to the network;
wherein said Temporal Global Identity is at least a 128-bit long code and is changed by said removable secure element at least before said first device enters in said sleeping mode and the code is generated randomly;
wherein said Temporal Global Identity is not modified if a simple READ command of the said Temporal Global Identity is sent to said removable secure element.