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
-
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},
url = {https://eprint.iacr.org/2013/505}
}
