DT-CP: A Double-TTPs-Based Contract-Signing Protocol With Lower Computational Cost

Xu, Guangquan; Zhang, Yao; Jiao, Litao; Panaousis, Emmanouil; Liang, Kaitai; Wang, Hao; Li, Xiaotong

doi:10.1109/access.2019.2952213

Cited by 13 publications

(6 citation statements)

References 33 publications

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“…Some authors [19,[21][22][23][24][25][26][27][28][29][30][31] used definitions that fit the definition we have called hard-timeliness. While other authors [8,9,13,15,[32][33][34][35][36][37][38][39][40][41][42][43][44][45] used definitions that fit the definition we have called soft-timeliness. Some introduced nuance: predetermined time [34,37], agreed time [35,36], bounded time [39], or that the protocol defines a deadline [45].…”

Section: Timelinessmentioning

confidence: 99%

A Hard-Timeliness Blockchain-Based Contract Signing Protocol

Ferrer-Gomila,

Hinarejos

2023

Computers

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In this article, we present the first proposal for contract signing based on blockchain that meets the requirements of fairness, hard-timeliness, and bc-optimism. The proposal, thanks to the use of blockchain, does not require the use of trusted third parties (TTPs), thus avoiding a point of failure and the problem of signatories having to agree on a TTP that is trusted by both. The presented protocol is fair because it is designed such that no honest signatory can be placed at a disadvantage. It meets the hard-timeliness requirement because both signatories can end the execution of the protocol at any time they wish. Finally, the proposal is bc-optimistic because blockchain functions are only executed in case of exception (and not in each execution of the protocol), with consequent savings when working with public blockchains. No previous proposal simultaneously met these three requirements. In addition to the above, this article clarifies the concept of timeliness, which previously has been defined in a confusing way (starting with the authors who used the term for the first time). We conducted a security review that allowed us to verify that our proposal meets the desired requirements. Furthermore, we provide the specifications of a smart contract designed for the Ethereum blockchain family and verified the economic feasibility of the proposal, ensuring it can be aligned with the financial requirements of different scenarios.

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Section: Timelinessmentioning

confidence: 99%

A Hard-Timeliness Blockchain-Based Contract Signing Protocol

Ferrer-Gomila,

Hinarejos

2023

Computers

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“…Mahajan et al proposed a new method for contract selection based on cisoidal analysis to eliminate certain elements in the entire contract space to enhance contract selection and thus obtain a better contract for signing [25,26]. Xu et al proposed an efficient contract signing agreement in the Internet of Things to solve the problem that the existing contract signing agreement cannot meet the requirements of future Internet of Things applications for efficiency and convenience [27]. Xu et al proposed an abuse free contract signing protocol with low storage trusted third party to solve the problem of eliminating huge energy consumption from inappropriate protocol design [28].…”

Section: Contract Signingmentioning

confidence: 99%

Delegate contract signing mechanism based on smart contract

Xiong

Hu²

2022

PLoS ONE

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In this paper, a delegate contract signing solution is proposed to eliminate the potential risk of contract fraud caused by information and interest asymmetry. By utilizing the functional properties of the Ethereum blockchain and smart contracts, a delegate contract signing mechanism is established. By running the mechanism, the delegate contract signing information is received and processed, and the information is broadcast to the blockchain network nodes. By designing the algorithms of "requesting contract signing", "successful contract signing" and "contract fraud dispute resolution", the delegate contract signing is realized. By proposing algorithms and their calling processes, the smart contracts are completed. Finally, the smart contracts based on the solution are tested and verified. The source code of the smart contracts has been published on GitHub.

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“…Besides, the user behavior data is very private data, and therefore we need to protect data security through security measures [20], [21]. Wireless sensor networks [22]- [24] are an important part of the IoT systems,and the development of wireless sensor networks has greatly increased the type and amount of data collected, so efficiency issues must be considered in IoT systems to reduce computing costs [25].…”

Section: F Complexity Analysismentioning

confidence: 99%

TT-SVD: An Efficient Sparse Decision-Making Model With Two-Way Trust Recommendation in the AI-Enabled IoT Systems

Zhao

Jiao

et al. 2021

IEEE Internet Things J.

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The convergence of AI and IoT enables data to be quickly explored and turned into vital decisions, and however, there are still some challenging issues to be further addressed. For example, lacking of enough data in AI-based decision making (socalled Sparse Decision Making, SDM) will decrease the efficiency dramatically, or even disable the intelligent IoT networks. Taking the intelligent IoT networks as the network infrastructure, the recommendation systems have been facing such SDM problems. A naive solution is to introduce trust information. However, trust information may also face the difficulty of sparse trust evidence (a.k.a sparse trust problem). In our work, an accurate sparse decision-making model with two-way trust recommendation in the AI-enabled IoT systems is proposed, named TT-SVD. Our model incorporates both trust information and rating information more thoroughly, which can efficiently alleviate the abovementioned sparse trust problem and therefore be able to solve the cold start and data sparsity problems. Specifically, we first consider the two-fold trust influences from both trustees and trusters, which can be represented by a factor named trust propensity. To this end, We propose a dual model, including a truster model (TrusterSVD) and a trustee model (TrusteeSVD) based on an existing rating-only recommendation model called SVD++, which are integrated by the weighted average and yield the final model, TT-SVD. The experimental results show that our model outperforms the state-of-the-art including SVD and TrustSVD in both the "all users" and "cold start users" cases, and the accuracy improvement can reach a maximum of 29%. Complexity analysis shows that our model is equally suitable for the case of large sparse datasets. In a summary, our model can effectively solve the sparse decision problem by introducing the two-way trust recommendation, and hence improve the efficiency of the intelligent recommendation systems.

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DT-CP: A Double-TTPs-Based Contract-Signing Protocol With Lower Computational Cost

Cited by 13 publications

References 33 publications

A Hard-Timeliness Blockchain-Based Contract Signing Protocol

A Hard-Timeliness Blockchain-Based Contract Signing Protocol

Delegate contract signing mechanism based on smart contract

TT-SVD: An Efficient Sparse Decision-Making Model With Two-Way Trust Recommendation in the AI-Enabled IoT Systems

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