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A formal model of fair exchange protocols

Science in china(Series F) 2005年第4期48卷 499-512页

作者： QING Sihan1,2.3.& LI Gaicheng1,2.3.1. Engineering Research Center for information Security {3., Institute of Software, Chinese Aca- demy of Sciences, Beijing {2., china 2. Beijing zhongke ansheng corporation of information {3., Beijing {2., china 3. Graduate School of the Chinese Academy of Sciences, Beijing 10003., china Engineering Research Center for information Security technology Institute of Software Chinese Academy of Sciences Beijing China Beijing zhongke ansheng {2. of {3. technology Beijing China Graduate School of the Chinese Academy of Sciences Beijing China

Based on the study of existing fair exchange protocols, this paper sets up an accurate formal model by stepwise refinement. In the process of refinement an unreliable channel is employed to simulate an attack behavior. The model provides a novel formal definition of exchanged items, and presents the formal goals for fairness, accountability, etc., reflecting the inherent requirements for fair exchange protocols across-the-board. In order to check, prove, and design fair exchange protocols effectively and efficiently, the model puts forward a novel property of abuse-freeness which applies to all fair exchange protocols, gives a formal definition for trust strand of the third party, and presents general criteria of designing a secure and effective fair exchange protocol. Taking a typical fair exchange protocol as an example, this paper presents the analysis steps of fair exchange protocols appealing to our model. An unknown attack is uncovered. The analysis reveals the process of a complete attack, discovering deeper reasons for causing an attack. Finally, we modify the flawed protocol and the revised protocol ensures the desirable properties.

关键词： events local causal relation local temporal relation global relation exchanged item security goals.

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Formal analysis and design of multi-party fair exchange protocols

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Science in china(Series F) 2006年第2期49卷 155-174页

作者： QING Sihan1,2.3.& LI Gaicheng1,3.1. Engineering Research Center for information Security technology, Institute of Software, Chinese Academy of Sciences, Beijing {2., china 2. Beijing zhongke ansheng corporation of information technology, Beijing {2., china 3. Graduate School of the Chinese Academy of Sciences, Beijing 10003., china Engineering Research Center for information Security technology Institute of Software Chinese Academy of Sciences Beijing China Beijing zhongke ansheng {2. of {3. technology Beijing China Graduate School of the Chinese Academy of Sciences Beijing China

Based on the origin of message items and channel combination between transacting parties, and events and relations among events, this paper presents a concise, precise, and hierarchical model for general fair exchange protocols, formally specifies various security requirements which are able to reflect inherent requirements for fair exchange protocols more rigorously, and partition these security requirements with fine granularity. This work helps analyze, debug, and design multi-party fair exchange protocols more effectively and elaborately,

关键词： fair exchange logical protocol formal model security requirement.

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基于MSR和AMSR的红外融合增强算法

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应用科学学报 2022年第3期40卷 423-433页

作者：刘硕瞿崇晓祝中科张福俊范长军中国电子科技集团公司第五十二研究所浙江杭州310000

红外传感器的成像特点,使得所采集的红外图像存在对比度低、清晰度差、信噪比低、边缘信息模糊等问题。为此提出基于多尺度视网膜(multi-scale retinex,MSR)和自适应多尺度视网膜(adaptive multi-scale retinex,AMSR)的红外融合增强及... 详细信息

红外传感器的成像特点,使得所采集的红外图像存在对比度低、清晰度差、信噪比低、边缘信息模糊等问题。为此提出基于多尺度视网膜(multi-scale retinex,MSR)和自适应多尺度视网膜(adaptive multi-scale retinex,AMSR)的红外融合增强及其优化算法。实验结果表明,所提算法能够有效提高红外图像的对比度和清晰度,在主观视觉效果和客观评价指标上均优于单尺度视网膜算法、MSR算法、AMSR算法。

关键词：红外融合增强多尺度视网膜自适应多尺度视网膜

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