摘要：

现有公钥基础设施(PKI)无法实现对信任的细粒度控制。针对该问题，借鉴模块化的信任评估模型，设计一种基于主观逻辑的信任评估模型。利用主观逻辑中的直接信任、推荐信任、合意操作实现信任的建立、传递与评估，通过退化操作实现信任度随时间衰减的拟合，分析非独立的信任混联传递。研究结果表明，该模型能够精确地计算信任度，提高PKI系统的可信性。

关键词: 信任评估, 主观逻辑, 公钥基础设施, 非独立信任混联传递, 可信性, J?sang模型

Abstract:

Trust degrees of Certificate Authority(CA) are ignored in present Public Key Infrastructure(PKI). In modularized trust management model, complete subjective logic trust evaluation model is proposed, with direct trust, recommendation and consensus operators to establish, transfer and calculate trust, and degeneration operator to simulate trust attenuation. The dependent series-parallel graphs are analyzed. The methods of subjective logic are testified to compute the trust value precisely and to improve the creditability of PKI system.

Key words: trust evaluation, subjective logic, Public Key Infrastructure(PKI), dependent series-parallel graphs, creditability, J?sang model

中图分类号: 

• TP309