Specification and verification of confidentiality in software architectures

Ulu, Cemil
This dissertation addresses the confidentiality aspect of the information security problem from the viewpoint of the software architecture. It presents a new approach to secure system design in which the desired security properties, in particular, confidentiality, of the system are proven to hold at the architectural level. The architecture description language Wright is extended so that confidentiality authorizations can be specified. An architectural description in Wright/c, the extended language, assigns clearance to the ports of the components and treats security labels as a part of data type information. The security labels are declared along with clearance assignments in an access control lattice model, also expressed in Wright/c. This enables the static analysis of data flow over the architecture subject to confidentiality requirements as per Bell-LaPadula principles. An algorithm takes the Wright/c description and the lattice model as inputs, and checks if there is a potential violation of the Bell-LaPadula principles. The algorithm also detects excess privileges. A software tool, which features an XML-based front-end to the algorithm is constructed. Finally, the algorithm is analyzed for its soundness, completeness and computational complexity.


Software process improvement
Elalmış, Mert Erkan; Yücel, Melek D; Department of Electrical and Electronics Engineering (2007)
In this thesis the software development process and in particular, the requirements management processes in a major software development company have been investigated. The current problems related to requirements quality and process performances have been identified. Process improvement measures have been proposed based on the suggestions found in the relevant literature. The current process and the improved version have been compared with respect to the process evaluation metrics proposed particularly for...
Design and implementation of an open security architecture for a software-based security module
Kaynar, Kaan; Özgit, Attila; Department of Computer Engineering (2009)
Main purpose of this thesis work is to design a comprehensive and open security architecture whose desired parts could be realized on a general-purpose embedded computer without any special cryptography hardware. The architecture provides security mechanisms that implement known cryptography techniques, operations of some famous network security protocols and appropriate system security methods. Consequently, a server machine may offload a substantial part of its security processing tasks to an embedded com...
Design and implementation of a monitoring framework
Kuz, Kadir; Doğru, Ali Hikmet; Department of Computer Engineering (2009)
In this thesis work, the symptoms in Windows XP operating system for fault monitoring are investigated and a fault monitoring library is developed. A test GUI is implemented to examine this library. Performance tests including memory and CPU usage are done to see its overhead to the system and platform tests on the current version of Windows operating system series (Windows Vista) are done to see for compatibility. In this thesis, fault monitor-fault detector interface is also defined and implemented. To mo...
Design and implementation of a plug-in framework for distributed object technologies
Kadıoğlu, Koray; Doğru, Ali Hikmet; Department of Computer Engineering (2006)
This thesis presents a framework design and implementation that enables run-time selection of different remote call mechanisms. In order to implement an extendable and modular system with run-time upgrading facility, a plug-in framework design is used. Since such a design requires enhanced usage of run-time facilities of the programming language that is used to implement the framework, in this study Java is selected because of its reflection and dynamic class loading facilities. A sample usage of this frame...
Performance analysis of a power aware routing protocol for ad hoc networks
Yazıcı, Mehmet Akif; Bilgen, Semih; Department of Electrical and Electronics Engineering (2006)
In this thesis, performance of the Contribution Reward Routing Protocol with Shapley Value (CAP-SV), a power-aware routing protocol for ad hoc networking is analyzed. Literature study on ad hoc network routing and ower-awareness is given. The overhead induced by the extra packets of the redirection mechanism of CAP-SV is formulized and the factors affecting this overhead are discussed. Then, the power consumption of CAP-SV is analytically analized using a linear power consumption model. It is shown that CAP...
Citation Formats
C. Ulu, “Specification and verification of confidentiality in software architectures,” Ph.D. - Doctoral Program, Middle East Technical University, 2004.