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A TCB mandatorily embeds (select all that apply):
Software components
Firmware components
Hardware components
Mechanical components
The trusted computing base (TCB) is everything in a computing system that provides a secure environment. This includes the operating system and its provided security mechanisms, hardware, physical locations, network hardware and software, and prescribed procedures. Typically, there are provisions for controlling access, providing authorization to specific resources, supporting user authentication, guarding against viruses and other forms of system infiltration, and backup of data. It is assumed that the TCB has been or should be tested and/or verified.
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 or vulnerabilities occurring inside the TCB might jeopardize the security properties of the entire system. By contrast, parts of a computer system outside the TCB must not be able to misbehave in a way that would leak any more privileges than are granted to them in accordance to the security policy.
The careful design and implementation of a system's trusted computing base is paramount to its overall security. Modern operating systems strive to reduce the size of the TCB so that an exhaustive examination of its code base (by means of manual or computer-assisted software audit or program verification) becomes feasible. https://en.wikipedia.org/wiki/Trustedcomputingbase (TK)
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