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Idaho State University

Glossary

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Trusted Computing Base
  • The totality of protection mechanisms within a computer system including hardware, firmware, and software -the combination of which are responsible for enforcing a security policy. A TCB consists of one or more components that together enforce a unified security policy over a product or system. The ability of a TCB to correctly enforce a security policy depends solely on the mechanisms within the TCB and on the correct input by system administrative personnel of parameters (e. g. , a user's clearance) related to the security policy. (DOD 5200,28-STD; AFR 205-16) 2. The totality of protection mechanisms within a computer system, including hardware firmware, and software, the combination of which is responsible for enforcing a security policy. A TCB consists of one or more components that together enforce a unified security policy over a product or system. The ability of a TCB to enforce correctly a unified security policy depends solely on the mechanisms within the TCB and on the correct input by system administrative personnel of parameters (e. g. , a user's clearance level) related to the security policy. (NCSC-TG-004-88)