Patent ID: 6711262
Filing Date: 2004-03-23
Classification: G06Q,G07F,H04L,H04W

Abstract:
In a data communication system that includes a data communication network, a terminal device connected to the data communication network, a subscriber identity module connected to the terminal device and containing a stored application for use by the terminal device and which makes use of the data communication network, and an application control server connected to the data communication network, a procedure for controlling the application stored in the subscriber identity module, comprising the steps of:storing in the subscriber identity module a key list comprising a plurality of keys associated with the stored application, said keys comprising a closing key for use in closing the application and an activation key for use in activating the application; storing in the application control server a server key list corresponding to the key list stored in the subscriber identity module; generating at the application control server one of an activating message including the activation key stored in the server key list and a closing message including the closing key stored in the server key list; transmitting the generated one of the activating message and the closing message from the application control server to the subscriber identity module; and checking, at the subscriber identity module after receipt from the application control server of the transmitted one of the activating message and the closing message, the key included in the received one of the activating message and the closing message against the key list stored in the subscriber identity module and, if the received key is found to match one of the stored keys, activating the application if the received key matches the activation key in the stored key list in the subscriber identity module and closing the application if the received key matches the closing key in the stored key list in the subscriber identity module.