针对大多数现有技术主要依据可信硬件来保护虚拟机(VM,virtual machine)运行平台的安全,而缺乏对VM安全存储和可信启动保护的问题,提出了一种解决在云平台基础设施服务策略(IaaS,Infrastructure as a Service)下VM的安全存储和可信启动(SSTL,secure storage and trusted launch)方案.根据可信平台模块(TPM,trusted platform module)的一些核心功能,分别从VM镜像加解密、VM宿主平台信息的远程证明和VM度量机制来保证VM存储安全、VM运行环境的安全以及VM可信启动.实验测试与分析表明该系统能够防止非授权启动VM,并能检测针对VM的系统服务描述符表(SSDT,system services descriptor table)以及Kernel Module等系统核心模块攻击.并且对原有系统的性能损耗在允许范围之内,不影响用户的正常使用.
To prevent malicious virtual machine from harming the security of vTPM-VM live migration process, we propose an improved vTPM-VM live migration protocol which uses a TPM-based integrity verification policy and a specific encryption scheme to enhance security. The TPM-based integrity verification policy is presented to ensure that all participating entities in this process are trustworthy. In data transfer phase, the specific encryption scheme is designed to associate the decipher process with one certain platform status so that only the destination platform can gain the key data of the migrated VM and vTPM instance. The security of this new protocol is analyzed. The results show that this protocol can effectively resist most of the attacks in the process of vTPM-VM live migration.
In Trust Zone architecture, the Trusted Application(TA) in the secure world does not certify the identity of Client Applications(CA) in the normal world that request data access, which represents a user data leakage risk. This paper proposes a private user data protection mechanism in Trust Zone to avoid such risks. We add corresponding modules to both the secure world and the normal world and authenticate the identity of CA to prevent illegal access to private user data. Then we analyze the system security, and perform validity and performance tests.The results show that this method can perform effective identity recognition and control of CA to protect the security of private user data. After adding authentication modules, the data operation time of system increases by about0.16 s, an acceptable price to pay for the improved security.
