Paper 2013/505

Improvement of One Anonymous Identity-Based Encryption

Zhengjun Cao and Lihua Liu

Abstract

In 2009, Seo et al. proposed an anonymous hierarchical identity-based encryption (IBE). The ciphertext consists of $(C_1, C_2, C_3, C_4)$, where $C_1$ is the blinded message, $C_4$ is the blinded identity, both $C_2$ and $C_3$ are used as decrypting helpers. To prove its security, the authors defined five games and introduced a strong simulator who is able to select different Setups for those games. In this paper, we optimize the IBE scheme by removing one decrypting helper and the strong simulator. We show its security under the $\ell$-computational Diffie-Hellman assumption with a normal simulator who only requires a unique Setup.

Metadata
Available format(s)
PDF
Category
Cryptographic protocols
Publication info
Preprint. MINOR revision.
Keywords
Anonymous identity-based encryptionbilinear groups of composite orderdoubly randomized keystrong simulator.
Contact author(s)
liulh @ shmtu edu cn
History
2013-08-17: received
Short URL
https://ia.cr/2013/505
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2013/505,
      author = {Zhengjun Cao and Lihua Liu},
      title = {Improvement of One Anonymous Identity-Based Encryption},
      howpublished = {Cryptology ePrint Archive, Paper 2013/505},
      year = {2013},
      note = {\url{https://eprint.iacr.org/2013/505}},
      url = {https://eprint.iacr.org/2013/505}
}
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