在分析可信计算组织TCG可信计算平台现有密码机制的不足的基础上,给出了一种改进的可信计算平台密码机制,在可信平台模块(TPM)内增加了对称引擎,采用统一的授权协议,精简了密钥授权访问认证,解决了TPM密钥内外部不同步的问题.通过在可信计算平台相关标准和产品中的实际应用表明,改进后的密码机制进一步增强了TPM的安全性,提高了可信计算平台的适用性. Based on the analysis of the shortcomings of the existing cryptosystem of Trusted Computing Group TCG trusted computing platform, this paper proposes an improved cryptographic mechanism of trusted computing platform, adds a symmetric engine within Trusted Platform Module (TPM) Unified authorization protocol to streamline key authorization access authentication and solve the internal and external asynchronous TPM key issues.Through the practical application of trusted computing platform related standards and products show that the improved password mechanism to further enhance the TPM Security, improve the applicability of trusted computing platform.