Multi-party Non-repudiation Protocol Research Articles

Fairness Analysis for Multiparty Nonrepudiation Protocols Based on Improved Strand Space

Aimed at the problem of the fairness analysis for multiparty nonrepudiation protocols, a new formal analysis method based on improved strand space is presented. Based on the strand space theory, signature operation is added; the set of terms, the subterm relation and the set of penetrator traces are redefined and the assumption of free encryption is extended in the new method. The formal definition of fairness in multi-party non-repudiation protocols is given and the guideline to verify it based on improved strand space is presented. Finally, the fairness of multi-party non-repudiation protocols is verified with an example of Kremer-Markowitch protocol, which indicates that the new method is suitable for analyzing the fairness of multiparty nonrepudiation protocols.

A fair non-repudiation framework for data integrity in cloud storage services

Data storage is one of the most profitable applications on the cloud computing platforms. Although a transparent service model provides more flexibility and convenience, it may be subject to the loss of data integrity. Our study revealed vulnerability in some commercial cloud storage services, which potentially will lead to disputation between client and service provide or among multiple uses. In this paper, we propose a framework that supports a fair data transmission procedure without the risk of disputation. A basic two-party non-repudiation (TPNR) protocol and an advanced multi-party non-repudiation protocol (MPNR) are proposed. Rationales behind the new protocol’s design and its working modes are presented in detail. We also discuss its robustness in the face of typical malicious network attacks.

A Fair Multi-Party Non-Repudiation Protocol

Practical multi-party non-repudiation protocols must respect viability,fairness,timeliness,exclusion-freeness and confidentiality.In this paper,the authors point out that most of the existing representative multi-party non-repudiation protocols with online trusted third party,such as KM and its extensional version OZCL and OZL,lack the supports for the properties of timeliness and exclusion-freeness,and are vulnerable to denial of the non-repudiation service attack and so on.Bearing these issues in mind,the authors present a new protocol NKM,which respects timeliness with time-span notion,which does not need any global clock synchronism mechanism,and respects exclusion-freeness and confidentiality with double group encryption notion,and makes evidence managed efficiently and avoids potential denial of non-repudiation service attack and replay attack with evidence chain notion.Subsequently,the authors give a formal analysis of its security and put some consideration on some security issues of protocol deployment.Compared with existing protocols,NKM have advantage over them in terms of security and performance and can be a practical protocol.

Non-repudiation protocols for multiple entities

Non-repudiation is a security service that provides cryptographic evidence to support the settlement of disputes. In this paper, we introduce the state-of-the-art of non-repudiation protocols for multiple entities. We extend an existing multi-party non-repudiation (MPNR) protocol to allow an originator to send different messages to many recipients in a single transaction. We further propose an optimistic multi-party non-repudiation protocol for exchange of different messages. The performance of our protocols with enhanced functionalities is still promising in comparison with existing MPNR protocols.

Fair multi-party non-repudiation protocols

In this paper we introduce the concept of multi-party non-repudiation protocols. We define the aims of multi-party non-repudiation protocols, compare them to multi-party fair exchange and show some fundamental differences. We present two protocols, the first one using an online trusted third party and the second one using an offline trusted third party. We also show how to modify each of these protocols in order to provide confidentiality. The definitions and the resulting protocols are more general than the only comparable work, a multi-party certified e-mail protocol.