Embedded safety ship of real-time clock and method for correcting real-time clock thereof

Abstract

The present invention reveals one kind of safety chip with built-in real-time clock. The safety chip includes: a real-time clock unit to provide data file with current time of the safety chip as the timestamp mark; an outer frequency generator to provide the clock unit with reference clock frequency; a clock calibrator to correct the error of the real-time clock unit for clock sync; an enciphering unit to generate cipher key based on enciphering algorithm for the safety protection and confirmation of the safety chip read / write; and an MCU to provide the chip operation system with operation back-up and management. In addition, the present invention reveals also method of correcting the real-time clock of the safety chip. The safety chip provides data signature with non-repudiation timestamp, and can use time information in various kinds of safety service and perfect the function of safety chip.

Description

technical field [0001] The invention relates to the technical field of computer security, and belongs to the security technology for extending the security chip system structure. In particular, it relates to a method for embedding a real-time clock in a security chip and calibrating the security clock. Background technique [0002] In 1999, under the impetus of the TCPA (Trusted Computing Platform Alliance) organization initiated by Intel, IBM, HP, Microsoft, and Compaq, a trusted computing environment was built. This organization defines a framework for platform device authentication, as well as specifications for a security chip (TPM: Trusted Platform Module) embedded on the motherboard and upper-layer software middleware TSS (TrustedSoftware Stack). In 2003, the TCPA organization was reorganized into TCG (Trusted Computing Group) to perfect and supplement TPM and TSS. [0003] figure 1 is a block diagram representing the architecture of a prior art TCG security chip. ...

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Problems solved by technology

[0007] However, due to the characteristics of the counter itself, the method of using the counter has the following defects: 1) The counter has an overflow problem. When the counter is full and the overflow reset occurs, the value will inevitably be provided repeatedly, so that it is impossible to distinguish between two digital signatures. Time difference, so two identical documents appear; 2) During the period when the counter increases by a fixed value, if there are two signatures that need to be timestamped, then the same value will be provided, so two identical documents will appear Document; 3) Since the value of the counter is the same when the security chip is turned off and the next time it is started, and if it is required to add a time stamp at this time, the same value will also be provided, resulting in two identical documents

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