Welcome to the resource topic for 2013/505
Title:
Improvement of One Anonymous Identity-Based Encryption
Authors: Zhengjun Cao, 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.
ePrint: https://eprint.iacr.org/2013/505
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