Reliable platform control module based on ATX power supply and running method thereof

Abstract

The invention relates to a reliable platform control module based on an ATX power supply. The module includes a sequential control unit and an SPI master controller, wherein the sequential control unit is connected with the ATX power supply, the ATX power supply provides standby voltage (5VSB) for the sequential control unit to serve as the working voltage of the reliable platform control module, and according to the configuration of the sequential control unit, when a power-on signal is received from the SPI master controller, the ATX power supply is instructed to power on an ATX power supply module of a computer mainboard; the SPI master controller is connected with a BIOS flash memory of a computer mainboard through an SPI bus and supplies power to the BIOS flash memory, and according to the configuration of the SPI master controller, after the reliable platform control module is powered on, BIOS codes are read from the BIOS flash memory, hashed values of the BIOS codes are generated, the hashed values are compared with referential hashed values, and then the power-on signal is sent to the sequential control unit under the circumstance that the hashed values are equal to the referential hashed values. The invention also relates to a method for running the module.

Description

technical field [0001] The present invention generally relates to the field of information security, in particular to a trusted platform control module based on an ATX power supply and an operating method thereof. Background technique [0002] A trusted platform module (Trusted Platform Module, TPM) is a hardware device, which is connected to a computer motherboard, and is used to verify identity and process variables used by the computer in a trusted computing environment. The TPM and the data stored in it are usually separated from all other components of the computer. [0003] The Trusted Platform Module in the prior art is a separate module controlled by the motherboard, so it cannot guarantee the integrity of the BIOS code of the motherboard itself. Today, the motherboard BIOS code is more and more vulnerable to attack and tampering, the traditional TPM can no longer guarantee the credibility of the computer platform. [0004] In recent years, a trusted platform contr...

AI Technical Summary

Problems solved by technology

However, in this TPCM, the TPCM and the entire BIOS circuit need to be powered on at the same time at first, which brings potential safety hazards, because when the entire BIOS circuit is powered, the electric energy may be poured back into other hardware devices on the motherboard, making it possible to pass tampering. In view of this, in this TPCM, after the TPCM and the entire BIOS circuit are powered on, it is necessary to check the current usage status of other hardware resources on the motherboard, that is, the power-on situation. Adds to the complexity and cost of making credible control processes

In addition, when the entire BIOS circuit is powered on, the computer south bridge device may be in a working state, which may interfere with the TPCM SPI master device's access to the flash memory

In addition, the existing TPCM is generally integrated on the motherboard and the circuit of the motherboard must be modified, which increases the installation cost or hardware cost

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