关键词: 动态秘密共享, 多重秘密共享, RSA密码体制, 安全

Abstract: This paper proposes a new dynamic threshold multi-secret sharing scheme.In the scheme，each participant’s secret shadow is selected by the participant himself and the shadows don’t need to change when the shared secret is renewed，and many secrets can be shared once.In the recovery phase，each participant can check whether another participant provides the true information，so a secure channel between them is unnecessary.The shadows do not need to be changed when the shared secret is renewed.Old participants are deleted or new participants are added.Analyses show that this scheme is computationally secure and practical.

Key words: dynamic secret sharing, multi-secret sharing, RSA cryptosystem, security