IDENTITY-BASED FORWARD SECURE THRESHOLD SIGNATURE SCHEME BASED ON MEDIATED RSA

Jia Yu, Rong Hao, Fanyu Kong, Xiangguo Cheng, Huawei Zhao, and Yangkui Chen

Keywords

Forward security, digital signature, IDbased cryptography, mediated RSA

Abstract

Identity-based cryptography plays an important role in current electronic applications. Mediated Rivest-Shamir-Adleman (RSA) is a simple method of sharing RSA secret keys between the user and the security mediator (SEM). Any signature operation must involve these two parties. In this paper, we newly propose an identity-based forward secure threshold signature scheme based on mediated RSA. In this scheme, threshold users can combine multiple mediators to generate a valid signature. The public key can be any identity information such as mail address or internet protocol (IP) address. The scheme has forward security because the secret key is useless for the adversary after it is renewed. At last, we give the related analysis.

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