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Efficient identity-based online/offline encryption and signcryption with short ciphertext

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Abstract

The technique of online/offline is regarded as a promising approach to speed up the computation of encryption, because the most part of computation, such as pairing over points on elliptic curve and exponentiation in groups, can be pre-computed in the offline phase without knowing the message to be encrypted and/or recipient’s identity. The online phase only requires light computation, such as modular multiplication. In this paper, we propose two novel identity-based online/offline schemes: a full secure identity-based online/offline encryption scheme and an identity-based online/offline signcryption scheme. Compared to the other schemes in the literature, our schemes achieve the shortest ciphertext size in both offline and online phases and demonstrate the best performance in offline computation. Our schemes are applicable to devices with limited computation power. They are proven secure in the random oracle model.

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Authors and Affiliations

  1. Centre for Computer and Information Security Research, School of Computing and Information Technology, University of Wollongong, Wollongong, NSW, Australia

    Jianchang Lai, Yi Mu & Fuchun Guo

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  1. Jianchang Lai
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  2. Yi Mu
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  3. Fuchun Guo
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Correspondence to Jianchang Lai.

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Lai, J., Mu, Y. & Guo, F. Efficient identity-based online/offline encryption and signcryption with short ciphertext. Int. J. Inf. Secur. 16, 299–311 (2017). https://doi.org/10.1007/s10207-016-0320-6

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  • DOI: https://doi.org/10.1007/s10207-016-0320-6

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