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您的检索式：作者名="HSU ChingFang"
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| 1 | Multipartite matroids and secret sharing显示文摘In a secret-sharing scheme,a secret value is distributed among a set of participants by giving each participant a share.The requirement is that only predefined subsets of participants can recover the secret from their shares.The family of the predefined authorized subsets is called the access structure.An access structure is ideal if there exists a secret-sharing scheme realizing it in which the shares have optimal length,that is,in which the shares are taken from the same domain as the secrets.Brickell and Davenport proved that ideal access structures are induced by matroids.Subsequently,ideal access structures and access structures induced by matroids have received a lot of attention.Seymour gave the first example of an access structure induced by a matroid namely the Vamos matroid,that is non-ideal.Since every matroid is multipartite and has the associated discrete polymatroid,in this paper,by dealing with the rank functions of discrete polymatroids,we obtain a sufficient condition for a multipartite access structure to be ideal.Furthermore,we give a new proof that all access structures related to bipartite and tripartite matroids coincide with the ideal ones.Our results give new contributions to the open problem,that is,which matroids induce ideal access structures. | HSU ChingFang TANG XueMing CHENG Qi XIAO HaiJun | 2010 | Chinese Science Bulletin2010，55，29： | 1 |
| 2 | A novel threshold changeable secret sharing scheme显示文摘A(t,n)threshold secret sharing scheme is a fundamental tool in many security applications such as cloud computing and multiparty computing.In conventional threshold secret sharing schemes,like Shamir’s scheme based on a univariate polynomial,additional communication key share scheme is needed for shareholders to protect the secrecy of their shares if secret reconstruction is performed over a network.In the secret reconstruction,the threshold changeable secret sharing(TCSS)allows the threshold to be a dynamic value so that if some shares have been compromised in a given time,it needs more shares to reconstruct the secret.Recently,a new secret sharing scheme based on a bivariate polynomial is proposed in which shares generated initially by a dealer can be used not only to reconstruct the secret but also to protect the secrecy of shares when the secret reconstruction is performed over a network.In this paper,we further extend this scheme to enable it to be a TCSS without any modification.Our proposed TCSS is dealer-free and non-interactive.Shares generated by a dealer in our scheme can serve for three purposes,(a)to reconstruct a secret;(b)to protect the secrecy of shares if secret reconstruction is performed over a network;and(c)to enable the threshold changeable property. | Lein HARN Chingfang HSU Zhe XIA | 2022 | Frontiers of Computer Science2022，16，1： | 1 |
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