Method for improving security of trusted application

A method for improving the security of a trusted application, the method is applied to an intelligent device, wherein the intelligent device provides a main operation system and a security execution system;

• wherein an upper computer connected to the intelligent device is provided;
• wherein the main operation system provides a first operation environment, and the security execution system provides a second operation environment;
• wherein a client application is provided, and the client application runs in the first operation environment;
• wherein a trusted application is provided, and the trusted application runs in the second operation environment;
• wherein the method comprises steps of:
• 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 the main operation system;
• obtaining the signature file package from the main operation system 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 will indicate that the trusted application is in a non-security state.