Received message verification

摘要

A method of verifying the validity of a message received by a telecommunications terminal (8) having a processor (30) and which is operable in a boot mode and a runtime mode is disclosed. In the embodiments the message is a SIM unlock message, for removing or modifying a restriction of the types of subscriber identity module (SIM) with which the mobile terminal may be used. In response to reception of the SIM unlock message when the terminal (1) is in the runtime mode, the processor 30 of the terminal (1) causes the terminal to enter the boot mode and verify the validity of the message during the boot mode. Because the validity of the message is checked during the boot mode, the check can be performed with greater security.

主权项

1. A method of verifying validity of a message received by a telecommunications terminal which is operable in a boot mode and a runtime mode, the message including a signature and a content, the method comprising:
in response to reception of the message by the terminal when the terminal is operating in the runtime mode, upon the terminal subsequently terminating operation in the runtime mode and entering operation in the boot mode, verifying validity of the signature of the message to extract the content of the message by the terminal while the terminal is operating in the boot mode; and verifying validity of the content extracted from the message to verify validity of the message by the terminal while the terminal is operating in the boot mode, wherein the message includes an instruction for modifying functionality of the terminal, and wherein the terminal is a mobile or cellular telecommunications terminal including an authentication component for authenticating the terminal with a mobile or cellular telecommunications network.