【Key words】 matroid； secret sharing schemes； multi-secret； representation of a matroid； attack by cheating； attack by searching；
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multi-secret 多重秘密
multi secret sharing 多秘密共享
multi-secret threshold schemes 多密门限体制
Efficient threshold multi-secret sharing scheme 一种高效的门限多重秘密分享方案
multi-level secret sharing 多等级密钥分享
This scheme can dynamically join or delete the participants and dynamically renew multi-secret, without re-distributing the sub-secrets.
可以动态地添加或删除参与者及更新多重秘密，而不需要重新分发子秘密。
In this paper we discussed the matroid structure of threshold schemes. We presented the conditions for the existence of ideal multi -secret threshold schemes.
本文讨论了门限体制的拟阵结构，得到理想的多密门限体制存在的条件。
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