Trusted systems1
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The document discusses network security and cryptography. It covers access matrices and lists, multilevel security models, security levels, trusted systems, and complete mediation, isolation, and verifiability as methods for enhancing system defenses against intruders and malicious programs. The document is authored by Sumita Das and references William Stallings' book on cryptography and network security principles and practices.
![[1]William Stallings, “Cryptography and
Network Security Principles and Practices”,
Fourth Edition
Created by Sumita Das](https://image.slidesharecdn.com/trustedsystems1-160914013934/85/Trusted-systems1-12-320.jpg)
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Trusted systems1
- 1. TRUSTED SYSTEMS Network Security And Cryptography By:- SUMITA DAS
- 2. To enhance the ability of a system to defend against- Intruders malicious programs. Created by Sumita Das
- 3. Access Matrix: Subject Object Access right Created by Sumita Das
- 4. Access Control List: Decomposition of the matrix by columns Created by Sumita Das
- 5. Capability list: Decomposition of the matrix by rows Created by Sumita Das
- 6. Protect data and resources on the basis of levels of security. Unclassified(U) Confidential(C) Secret(S) Top Secret(TS) Created by Sumita Das
- 7. Multilevel security: Multiple categories or levels of data Multilevel secure system must enforce: No read up (Simple Security Property) No write down(Property) Security levels may be linear or latticed Created by Sumita Das
- 8. Provides multilevel security for a data processing system Controlling element in the hardware and operating system of a computer that regulates the access of subjects to objects on the basis of security parameters of the subject and object. Created by Sumita Das
- 9. Created by Sumita Das
- 10. Complete mediation Isolation Verifiability Created by Sumita Das
- 11. Secure, trusted operating systems are one way to secure against Trojan Horse attacks Created by Sumita Das
- 12. [1]William Stallings, “Cryptography and Network Security Principles and Practices”, Fourth Edition Created by Sumita Das