Feedback one systems output is input to another

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Feedback – one systems output is input to another system and returned as input to the first system n Hookup – a system that communicates with another system and external entities n Internal Constructs: n Intersection, Union and Difference Conclusion – security maintained in cascading constructs but subject to other system variables for other constructs Orange Book – Trusted Computer Security Evaluation Criteria n (TCSEC) was developed in 1985 by National Computer Security Center (NCSC) n D – Minimal protection n Evaluated but fail to meet requirements n C – Discretionary Access Control n C1 – Discretionary Security Protection n Nominally satisfies discretionary controls n C2 – Controlled Access protection n Users accountability - through login and auditing n B – Mandatory Access Control n B1 – Labeled Security n Data labeling n Informal security policy model n B2 – Structured n Trusted Facility Management - Support Operator and Security Administrator n Covert Channel – Covert Storage Channels n Configuration Change Management – Development and Maintenance n B3- Security Domains n Trusted Facility Management – Identify Security Administrator Functions n Covert Channel – Covert Storage and Covert Timing Channels n Trusted Recovery Required n Configuration Change Management – Development and Maintenance n A – Verified Design n A1 – Verified Design
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n Trusted Facility Management – Identify Security Administrator Functions n Covert Channel – Covert Storage and Covert Timing Channels n Trusted Recovery Required n Configuration Change Management – Entire System Lifecycle European ITSEC TCSEC Common Criteria E0 D EAL1 F-C1, E1 C1 EAL2 F-C2, E2 C2 EAL3 F-B1, E3 B1 EAL4 F-B2, E4 B2 EAL5 F-B3, E5 B3 EAL6 F-B3, E6 A1 EAL7
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