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Server-Aided Revocable Identity-Based Encryption from Lattices

  • Khoa Nguyen
  • Huaxiong Wang
  • Juanyang Zhang
Conference paper
First Online:
Part of the Lecture Notes in Computer Science book series (LNCS, volume 10052)

Abstract

Server-aided revocable identity-based encryption (SR-IBE), recently proposed by Qin et al. at ESORICS 2015, offers significant advantages over previous user revocation mechanisms in the scope of IBE. In this new system model, almost all the workloads on users are delegated to an untrusted server, and users can compute decryption keys at any time period without having to communicate with either the key generation center or the server.

In this paper, inspired by Qin et al.’s work, we design the first SR-IBE scheme from lattice assumptions. Our scheme is more efficient than existing constructions of lattice-based revocable IBE. We prove that the scheme is selectively secure in the standard model, based on the hardness of the Learning with Errors problem. At the heart of our design is a “double encryption” mechanism that enables smooth interactions between the message sender and the server, as well as between the server and the recipient, while ensuring the confidentiality of messages.

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Notes

Acknowledgements

We thank Baodong Qin, Sanjay Bhattacherjee, and the anonymous reviewers for helpful discussions and comments. The research was supported by the “Singapore Ministry of Education under Research Grant MOE2013-T2-1-041”. Huaxiong Wang was also supported by NTU under Tier 1 grant RG143/14.

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© Springer International Publishing AG 2016

Authors and Affiliations

  1. 1.Division of Mathematical Sciences, School of Physical and Mathematical SciencesNanyang Technological UniversitySingaporeSingapore

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