Abstract
We present two hierarchical identity-based encryption (HIBE) schemes, denoted as \(\mathcal{H}_{1}\) and \(\mathcal{H}_{2}\), from Type-3 pairings with constant sized ciphertexts. Scheme \(\mathcal{H}_{1}\) achieves anonymity while \(\mathcal{H}_{2}\) is non-anonymous. The constructions are obtained by extending the IBE scheme recently proposed by Jutla and Roy (Asiacrypt 2013). Security is based on the standard decisional Symmetric eXternal Diffie-Hellman (SXDH) assumption. In terms of provable security properties, previous direct constructions of constant-size ciphertext HIBE had one or more of the following drawbacks: security in the weaker model of selective-identity attacks; exponential security degradation in the depth of the HIBE; and use of non-standard assumptions. The security arguments for \(\mathcal{H}_{1}\) and \(\mathcal{H}_{2}\) avoid all of these drawbacks. Based on the current state-of-the-art, \(\mathcal{H}_{1}\) and \(\mathcal{H}_{2}\) are the schemes of choice for efficient implementation of (anonymous) HIBE constructions.
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Ramanna, S.C., Sarkar, P. (2014). Efficient (Anonymous) Compact HIBE from Standard Assumptions. In: Chow, S.S.M., Liu, J.K., Hui, L.C.K., Yiu, S.M. (eds) Provable Security. ProvSec 2014. Lecture Notes in Computer Science, vol 8782. Springer, Cham. https://doi.org/10.1007/978-3-319-12475-9_17
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DOI: https://doi.org/10.1007/978-3-319-12475-9_17
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