Revocable Identity-based Signcryption Scheme without Random Oracles

Xiang-Song Zhang ； Zhen-Hua Liu ； Yu-Pu Hu ； Tsuyoshi Takagi

《International Journal of Network Security》 17卷2期 (2015/03) Pp. 110-122

https://doi.org/10.6633/IJNS.201503.17(2).02

並列摘要

Revocation functionality is crucial for the practicality of the public key cryptosystems including signcryption. When a user's private key is corrupted by hacking or the period of a contract expires, the cryptosystems must provide a revocation method to revoke the misbehaving/compromised user. However, little work has been published on key revocation in identity-based signcryption. We propose a revocable identity-based signcryption scheme. In the scheme, the master key is randomly divided into two parts: one is used to construct the initial key, the other is used to generate the updated key. Furthermore, they are used to periodically and re-randomly generate full private keys for non-revoked users. Thus, the proposed scheme can revoke users and resist key exposure. In the standard model, we prove the proposed scheme with IND-CCA2 security under the DBDH hardness assumption and EUF-CMA security under the CDH hardness assumption.

並列關鍵字

Bilinear pairings ； identity-based cryptography ； provable security ； revocation ； signcryption