TCB：可靠计算基础 （Trusted Computing Base）

可靠计算基础（TCB）就是计算系统中的每个事物都提供了一个安全环境。这包括操作系统和它提供的安全机制，硬件，物理定位，网络硬件和软件，指定处理过程。具有代表性的是控制访问的防备，对特殊资源的授权，支持用户身份验证，抵抗病毒和其他对系统的渗透，还有数据备份。假设可靠计算基础已经或必须被测试和验证通过。

The trusted computing base (TCB) of a computer system is the set of all hardware, firmware, and/or software components that are critical to its security, in the sense that bugs occurring inside the TCB might jeopardize the security properties of the entire system. By contrast, parts of a computer system outside the TCB supposedly cannot misbehave in a way that would leak any more privileges than was granted to them in the first place in accordance to the security policy.