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• W787306021 abstract "Software agents, as the main body of agent-oriented E-commerce systems, have a great potential for E-commerce applications. Agents can dynamically discover and compose E-services and mediate interactions, which can serve as delegates in order to handle routine tasks, monitor activities, set up contracts, execute business processes, and find the best services [Gri01, GK94, Nwa96]. However, agents are vulnerable to several attacks from the running environment, such as, insecure network, malicious users and malicious hosts, etc. Therefore, the success or failure of this paradigm is connected to the issues whether the mechanisms in agents can protect their security and privacy. Policy-based cryptography, which consists of two cryptographic primitives: policy-based encryption and policy-based signature, was firstly proposed by Bagga and Molva [BM06, BM05]. It has the advantage of addressing the security problems of software agents. We are motivated by the concept of policy-based cryptography [BM06, BM05] and use cryptographic primitives mentioned above to provide security and privacy for agents systems. There are several kinds of software agents, such as mobile agents, multi-agents, intelligent agents and distributed agents. In this thesis, we focus on mobile agents and multi-agents. Mobile agents have the ability of migrating across different execution environments. Due to this property, the security and privacy of mobile agents can be easily compromised when they are traveling on a hostile environment. Therefore, security and privacy are critical to mobile agents applied in E-commerce. There exist several solutions for mobile agent security [ST98b, KBC00, LKK01, ZMZ09], among which the proxy-based model is believed to be a sound solution to provide authentication, where the visiting host of an agent acts as a proxy signer who can sign an offer. However, any host (including a malicious host) could act as the signer to forge valid signatures. To solve this problem, a secure policy-based mobile agent scheme is introduced in this thesis, that is, only the hosts who satisfy the designated policies can generate a valid signature. A security model and a rigorous" @default.
• W787306021 created "2016-06-24" @default.
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• W787306021 date "2011-01-01" @default.
• W787306021 modified "2023-09-27" @default.
• W787306021 title "Policy-based secure agents" @default.
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