建構於階層式架構上的秘密分享機制

THUIR > College of Engineering > Department of Computer Science and Information > Master's Theses > Item 310901/5032

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Title:	建構於階層式架構上的秘密分享機制
Other Titles:	Efficient Secret Sharing with Access Structures in a Hierarchy
Authors:	李威 Lee, Wei
Contributors:	林祝興 Lin, Chu-Hsing 東海大學資訊工程學系
Keywords:	秘密分享;存取架構;階層式金鑰管理;離散對數;單項雜湊函數;對稱式加密 secret sharing;access structures;hierarchical key management;discrete logarithm;one-way hash function;symmetric key cryptography
Date:	2004
Issue Date:	2011-05-19T07:32:37Z (UTC)
Abstract:	Secret sharing with access structures in a hierarchy has two properties. First, each group wants to communicate with the others, the participants in the group need to share their secrets based upon access structures. Second, groups are divided into several levels, and each level has its own ancestors and descendants. Based upon the properties of hierarchical key management, only the ancestor groups can hold the descendant groups’ secret keys. In this paper, we suggest two approaches to solve the problem of secret sharing with access structures in a hierarchy. In the first approach, we use the concept of discrete logarithm to reuse shadows, and we adopt Cho’s mechanism to achieve the properties of hierarchical key management. The drawback of the first approach is to spend a lot of time on computation. In the second approach, we use one way hash function to allow the shadows to be reused, and we use the symmetric key cryptography to achieve the properties of hierarchical key management. The second approach is more efficient than the first one. The presented schemes are based upon general hierarchies. They are suitable for many real applications. For example, a business with hierarchical organization can use the proposed schemes to transmit documents and data, and military departments can exchange their reports by the proposed schemes to achieve the properties of hierarchical access control and secret sharing.
Appears in Collections:	[Department of Computer Science and Information ] Master's Theses

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