Amlogic (shanghai) Co., Ltd.

Yong Wan

Tao Zeng

Qi Cao

Peifu Jiang

Pengguang Zhu

A method for improving the security of a trusted application comprises: signing the trusted application in a hierarchical signature mode by the upper computer to generate a signature file package about the trusted application, and saving the signature file package in a main operation system; obtaining the signature file package and loading the signature file package to the second operation environment by the security execution system; parsing the signature file package by the security execution system to obtain a parsed result; and performing hierarchical verification on the parsed result by the security execution system, and if the hierarchical verification is passed, it will indicate that the trusted application is in a security state, otherwise, it is in a non-security state. The defects of lack of a security authentication mode for the trusted application and relatively low security due to mere adoption of a simple digital signature mechanism are overcome.

Method for improving security of trusted application

A frequency demultiplication adjustment method of PLL comprises obtaining a plurality of corresponding frequency demultiplication frequency points according to a default frequency demultiplication value of a phase-locked loop; obtaining a load state of the processor within a predetermined sampling period, and obtaining a target frequency point of the processor by the processor frequency adjustor; determining a frequency range of a virtual frequency point to be added according to the position of the target frequency point; performing calculation within the frequency range to obtain equivalent frequencies corresponding to virtual frequency points; judging whether the frequency of the target frequency point is equal to the equivalent frequency corresponding to the virtual frequency points; if not, switching the processor frequency adjustor to the corresponding frequency demultiplication frequency point; and adjusting the frequency demultiplication value of the phase-locked loop which outputs a clock source signal corresponding to the virtual frequency points to the processor.

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Shanghai, China

Yong Wan