Role-Based Signature and Its Security Proof

罗富财(FUCAI LUO) ； 林昌露(CHANGLU LIN) ； 朱岩(YAN ZHU)

《Journal of Information Science and Engineering》 32卷6期 (2016/11) Pp. 1525-1539

摘要

Role-Based Signature (RBS) allows users to sign messages on behalf of his roles under the widely adopted hierarchical Role-Based Access Control (RBAC) model, and the signatures are verified by using the public keys of the roles. In this paper, we firstly make some minor modifications on the role-based signature proposed by Zhu et al. [14]. The modified role-based signature is also based on the partial-order key hierarchy with respect to public key infrastructure, in which each user belongs to a role has a unique private-key to sign messages, and only the public keys of his roles can be used to verify the signatures. Furthermore, we define the formal security model and present a full security proof for the modified RBS using the Forking Lemma. Our proposed scheme is strong existentially unforgeable under the weak attack in the random oracles model. Its security depends on the strong Diffie-Hellman assumption.

關鍵字

cryptography ； security ； role-key hierarchy ； role-based signature ； proof of security