Abstract
While recent timed-release encryption (TRE) schemes are implicitly supported by a certificateless encryption (CLE) mechanism, the security models of CLE and TRE differ and there is no generic transformation from a CLE to a TRE. This paper gives a generalized model for CLE that fulfills the requirements of TRE. This model is secure against adversaries with adaptive trapdoor extraction capabilities, decryption capabilities for arbitrary public keys, and partial decryption capabilities. It also supports hierarchical identifiers. We propose a concrete scheme under our generalized model and prove it secure without random oracles, yielding the first strongly-secure security-mediated CLE and the first TRE in the standard model. In addition, our technique of partial decryption is different from the previous approach.
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Chow, S.S.M., Roth, V., Rieffel, E.G. (2008). General Certificateless Encryption and Timed-Release Encryption. In: Ostrovsky, R., De Prisco, R., Visconti, I. (eds) Security and Cryptography for Networks. SCN 2008. Lecture Notes in Computer Science, vol 5229. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-85855-3_9
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DOI: https://doi.org/10.1007/978-3-540-85855-3_9
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