摘要： 对不经意传输进行分布式设置可以更好地保障发送方的安全以及秘密消息的可达性。为此，提出一种基于秘密共享的分布式广义不经意传输协议，允许用户按发送方设定的特殊规则选择并获取一个合法的秘密消息集合。应用广义秘密共享接入结构的补集设置消息的检索规则，通过对多项式的构建以及重构实现协议的分布式特性。发送者根据加密消息、密钥以及校验值产生 3个对应的多项式，并将多项式分配给多个服务器，用户通过与一定数目的服务器通信获取所需信息。分析结果表明，该协议易于实现、计算简单，同时具有较高的通信效率和安全性。
关键词:
不经意传输,
秘密共享,
分布式模型,
广义模型,
检索结构,
接入结构
Abstract: For oblivious transfer, distributed settings can better protect the safety of the sender and the accessibility of secret message. So this paper presents a generalized oblivious transfer protocol in distributed setting based on secret sharing, which allows a user to select and retrieve a qualified subset of secret messages according to specific rules set by the sender. This protocol combines generalized secret sharing scheme and construction of polynomials, predefines the retrieve rules of messages by introducing the complement of secret sharing access structure and realizes the distributed setting with construction and reconstruction of polynomials. In the phase of construction, the sender builds three polynomials according to the encrypted messages, keys and verification value and sends the polynomials to the participating servers. The user obtains his requested messages by communicating with predefined number of servers. Analysis result indicates that this protocol is easy to implement with low computation complexity and ensures high efficiency and security as well.
Key words:
oblivious transfer,
secret sharing,
distributed model,
generalized model,
retrieve structure,
access structure
中图分类号: