Revocable identity-based signcryption scheme without random oracles

Xiangsong Zhang, Zhenhua Liu, Yupu Hu, Tsuyoshi Takagi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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 rerandomly 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.

Original languageEnglish
Pages (from-to)110-122
Number of pages13
JournalInternational Journal of Network Security
Issue number2
Publication statusPublished - 2015

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications


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