Oblivious Garbled Circuit Reconstruction and Mobile Agent Security

Oblivious Garbled Circuit Reconstruction and Mobile Agent Security

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This thesis addresses the problem of protecting mobile agents from malicious hosts. The focus of this work is on rigorous techniques for agent security; these techniques are based on cryptographic protocols, and in particular, the Co mputing with Encrypted Functions (CEF) technique. Yao's protocol [39] provided the paradigm based on which a large body of successive works were proposed for solvi ng this problem. Despite enormous progress, the approaches that are based on CEF are limited to the case where the agent is represented by a number of different encrypted circuits and where each circuit is designed for a specific host. In fact, these approaches led to an undesirable increase in the agent's size and to a-priori limited number of hosts to be visited by the agent. In this thesis, we present a survey on the state-of-the-art for securing the computation of mobile agents through the application of encryption functions. Mo reover, we propose a new cryptographic technique in the area of CEF called Oblivious Garbled Circuit Reconstruction (OGCR) that allows two or more hosts to execute the same encrypted circuit without revealing any specific property the circuit m ay have. We present a non-interactive protocol for oblivious garbled circuit recons truction, whose design is built on the assumption of the existence of one-way mapped encryption schemes. We also show how the application of OGCR protects the privac y of mobile agents. This application is designed with the aim of minimizing the size of the agent and enabling it to visit an unlimited number of hosts. New ide as, open issues, and interesting directions for future works are also indicated.The focus of this work is on rigorous techniques for agent security; these techniques are based on cryptographic protocols, and in particular, the Co mputing with Encrypted Functions (CEF) technique.


Title:Oblivious Garbled Circuit Reconstruction and Mobile Agent Security
Author: Deema Farouk Zurayk, American University of Beirut. Faculty of Arts and Sciences. Department of Computer Science
Publisher: - 2005
ISBN-13:

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