Establishment of Ad-Hoc Communities through Policy-Based Cryptography |
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Authors: | Walid Bagga Stefano Crosta Pietro Michiardi Refik Molva |
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Affiliation: | aInstitut Eurecom, Corporate Communications, 2229, route des Crêtes B.P. 193 06904 Sophia Antipolis (France) |
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Abstract: | A policy-based encryption scheme allows to encrypt a message according to a credential-based policy formalized as monotone Boolean expression written in standard normal form. The encryption is so that only the users having access to a qualified set of credentials for the policy are able to decrypt the message. In this paper, we first revisit the formal definition of policy-based encryption and describe a policy-based encryption scheme from bilinear pairings. Our scheme improves the one proposed in [W. Bagga and R. Molva. Policy-based cryptography and applications. In Proceedings of Financial Cryptography and Data Security (FC'05), volume 3570 of LNCS, pages 72–87. Springer-Verlag, 2005] in terms of ciphertext size, while at the same time preserving the computational efficiency. Then, we describe an application of policy-based encryption in the context of ad-hoc networks. More precisely, we show how the policy-based encryption primitive can be used to achieve a privacy-enhanced secure establishment of ad-hoc communities. |
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Keywords: | Bilinear Pairings Credentials Ad-Hoc Communities |
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