Wireless communication device and extensional subscriber identity module used in wtru

Abstract

The invention refers to a wireless communication device and an extensional subscriber identity module used in a WTRU (Wireless Transmit / receive Unit). The wireless communication device comprises a RTC (Real Time Clock) used for measuring current time, wherein the wireless communication device is configured to resynchronize the current time of the RTC with a security time server of the wireless communication device again coupled through network; a TPM (Trusted Platform Module) comprise a memory protected by the TPM; and a power supply fault unit configured to detect power supply faults in the wireless communication device, wherein the wireless communication device is further configured to safely store RTC time relative information in the memory protected by the TPM when a power supply fault detection unit is detected to have power supply faults.

Description

[0001] This application is a divisional application of an invention patent application with an application date of May 08, 2007, an application number of 200780016722.4, and a title of "Safe Time Function for Wireless Devices". technical field [0002] The present invention relates to wireless communication systems. More specifically, the present invention relates to secure time functionality for use on wireless devices. Background technique [0003] As the wireless industry spreads and grows, it is desired to develop wireless communication devices that can provide various functions. The smartphone market is in its early stages of adoption and offers many features such as access to corporate information systems (email and intranet access) and connectivity to Internet-based services, among others. Many of these features require confidential corporate and personal information to be stored on the device itself. Additionally, the growth of content-based services such as digita...

AI Technical Summary

Problems solved by technology

Another problem is that the current OMA DRM protocol leaves room for improvement in the processing of time information for DRM applications

[0018] Another problem: DRM devices are connected devices, they have the ability to re-sync their local clocks, and they will use the resulting DRM time as the base time provided by the RI, even though it may have originated from an Online Certificate Status Protocol (OCSP) service responder

[0019] Another problem is: the clock inside the DRM device can also be synchronized separately from the DRM process

However, although there are secure network timing protocols such as the IETF Secure NTP protocol, the timing information thus obtained following the Secure NTP protocol may subsequently be compromised once it is stored in a DRM device

This is likely to lead to unauthorized use and redistribution of DRM content

[0020] Another problem is: even if the DRM SW (DRM UA on the device, DRM SW of the RI) is safe and not compromised, other malicious or compromised SW applications may access these time-dependent resources or their output and erroneously use them

[0022] However, a direct application of existing TCG technology does not address a method to explicitly and systematically improve the confidence and integrity of DRM time on a device with a TPM, nor any method of ensuring time information on an RI with a TPM

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