基于TCM的网络安全访问模型

分析Google 公司的BeyondCorp 安全访问模型,基于TCM 标准的可信计算平台,借鉴BeyondCorp 企业安全方法,结合TNC 可信网络接入、用户PKC 证书验证和基于属性证书的访问控制,实现网络访问过程中的设备、用户身份认证和应用服务权限管理,从而提供一种适用于内网的身份认证、授权和访问控制的网络安全访问模型,以解决“企业内网不可信”的问题。最后,对该模型的安全性设计进行了描述。

基于PUF的物联网信任链管理方案

物联网的出现对社会生活的方方面面产生了极大影响,其蓬勃发展的同时也引入了新的安全问题。当前国内可信计算进入加速发展阶段,将可信计算技术应用到物联网信任链管理中,有效增强物联网系统的安全性。分析可信计算信任链的建立过程,基于PUF物理不可克隆技术,结合X509公钥密码体制,实现物联网环境下的信任链管理体系,从而提供一种具备可信终端防护能力和可信网络接入管理能力的方案,以解决物联网终端存在的内外部仿冒、篡改等安全问题。最后,对该方案的应用和推广价值进行了描述。

Crashworthiness Optimization of a Civil Airplane Sub-floor Structure

By means of controlling the deformation mode and reducing the contact stiffness, a sub-floor energy absorption structure of a civil airplane is designed. To improve the energy absorption features of the structure,the finite element model of the structure is built and ten design variables are choosen, based on the orthogonal experimental design; four typical structural impact responses of sample points are obtained by numerical analysis. According to an F-test, the design variables with high significance level are selected as the optimizing ones. An optimized subfloor structure is obtained by using the response surface model. The analysis results show that, compared to the reference structure ,the first peak value of the structural rigid acceleration of the optimized sub-floor structure reduces by 23.13 %, the second peak value reduces by 49.86%, the average value reduces by 43.71%, the energy absorption time increases by 78.32%, the efficiency of energy absorption increases significantly,as more materials join in the energy absorption process.