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Buttyan found out a security flaw in Ariadne (Y.C. Hu, A. Perrig, andD. B. Johnson, "Ariadne: a secure on-demand routing protocol for ad hoc networks," in Proc. of the Eighth ACM hitl Conf. on Mobile Computing and Networking (MOBI.COM 2002), pp.23-28. Atlanta, GA.2002.) and proposed a secure routing protocol, EndairA (L. Buttyan, and I. Vajda, "Towards(More)
In Eurocrypt 2003, Gentry introduced a new public key encryption paradigm called certificate-based encryption (CBE) to overcome the drawbacks of the conventional PKI and the identity based encryption (IBE). CBE provides an efficient implicit certification mechanism and allows a periodical update of certificate status while eliminating third-party queries(More)
The Fujisaki-Okamoto (FO) conversion is a generic conversion to enhance a public key encryption scheme with security of one-way against chosen plaintext attacks (OW-CPA) to security of indistinguishable against adaptive chosen ciphertext attacks (IND-CCA) in the random oracle model. Existing works have shown that the FO conversion also can generically(More)
Certificate-based encryption (CBE) is a new paradigm which overcomes the shortcomings of traditional public-key encryption and identity based encryption. CBE provides an efficient implicit certificate mechanism to eliminate third-party queries for the certificate status and to simplify the certificate revocation problem. Therefore, CBE can be used to(More)
In this paper we study the ontology-based inference attack problem in large distribute XML databases. Supported by the semantically rich ontologies, the ontology-based inference attack can lead to undesired information disclosure via replicated XML data under different syntactic formats and inconsistent secure classifications. To address this new security(More)
Protecting data of free-roaming mobile agents has drawn much attention in recent years. But no perfect solution has ever been proposed. Many of the solutions are vulnerable by colluded truncation attacks. In this study we analyze available methods, and design a novel mechanism by cooperation between two kinds of agents- Task Agent and Secondary Agent. It(More)
—Certificate-based encryption (CBE) is a new asymmetric encryption paradigm which combines traditional public-key encryption (PKE) and identity based encryption (IBE) while preserving some of their most attractive features. CBE provides an efficient implicit certificate mechanism to eliminate third-party queries for the certificate status and to simply the(More)
A number of logics have been proposed to analyze the cryptographic protocols, but most of them cannot explicitly express time factor which plays an important role in protocols. In this paper, we present a logic to model the time in cryptographic protocols. Our logic is based on the predicate modal logic, so, the time factor can be expressed by invoking a(More)
The data security of free-roaming mobile agent is a problem which hasn't been resolved totally, especially in the aspect of keeping away colluded truncation attacks. In this study we use mobile agent's clone, forming a new two-dimensional chain relation among multi-agent to protect the data collected by mobile agent. This new protocol can detect truncation(More)