关键词: 密钥泄漏, 基于身份的群签名, 密钥隔离, 可计算Diffie-Hellman（CDH）

Abstract: In order to reduce the damage caused by key exposure in ID-based group signatures, combined with key isolation technology, this paper proposes an ID-based key-insulated group signature scheme. The scheme ensures that even if the temporary private key of current time period is leaking, it will not affect the signature of other time periods. The scheme is based on the CDH difficult problem, and the security can be proved under the random oracle model. Under the same security conditions, the signature length is shorter and the structure is simpler.

Key words: key exposure, ID-based group signature, key-insulated, Computational Diffie-Hellman（CDH）