Abstract
Proxy re-encryption (PRE) allows a semi-trusted proxy to turn Alice’s ciphertexts into Bob’s ciphertexts, however, the proxy cannot get the corresponding plaintexts. Because of the special property, PRE achieves good reliability and secrecy. Nevertheless, most of the proposed proxy re-encryption schemes are based on the number theoretic problem and their security are proved in the random oracle. Therefore, this paper constructs an efficient and novel identity-based multi-bit PRE scheme based on the learning with errors (LWE) assumption and can resist to quantum attack. What’s more, it is proved to be CPA secure in the standard model and has the properties of multi-use and bidirectional.
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Acknowledgement
We really acknowledge the financial support the Nature Science Foundation of Anhui Higher Education Institutions No. KJ2016A027, No. KJ2017ZD032, No. KJ2018A0398, Anhui Provincial Natural Science Foundation of China, No. 1708085QF154.
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Hou, J., Jiang, M., Guo, Y., Song, W. (2018). Identity-Based Multi-bit Proxy Re-encryption Over Lattice in the Standard Model. In: Li, F., Takagi, T., Xu, C., Zhang, X. (eds) Frontiers in Cyber Security. FCS 2018. Communications in Computer and Information Science, vol 879. Springer, Singapore. https://doi.org/10.1007/978-981-13-3095-7_9
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DOI: https://doi.org/10.1007/978-981-13-3095-7_9
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