Abstract: This paper presents a new proactive secure multisecret sharing threshold scheme.In the scheme，participants can share multiple secrets and compute sub-secret for rebuilding efficiently and securely，and sub-secret hold by participant is verifiable.The scheme use verifiable secret sharing technique to against cheating by dealer and cheating by participants.The scheme is proactive secure，participants will update the sub-secret periodically without dealer intervention，old sub-secret will be obsolete and adversary can’t get any useful information from these.At the end，it is demonstrated that the scheme is security and efficient.

Key words: proactive security, multisecret sharing, discrete logarithm problem, threshold scheme

摘要： 给出了一种动态安全的多重密钥门限共享方案，在该方案中成员可以安全有效地共享多个密钥，具有动态安全性，能够在不改变共享秘密的前提下，周期性更新成员的子密钥，攻击者需要在更新周期内完成攻击过程，任意t个授权成员联合在任意时刻都可以恢复共享密钥，采用可验证的秘密共享方法能够有效地抵御管理者欺骗和成员欺骗，最后证明了方案的正确性和机密性。

关键词: 动态安全, 多重密钥共享, 离散对数问题, 门限方案