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New constructions for (multiparty) one-round key exchange with strong security

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Science China(Information Sciences) 2018年第5期61卷 332-337页

作者： Zheng YANG Junyu LAI School of Computer Science and Engineering Chongqing University of Technology Department of Computer Science University of Helsinki School of Aeronautics and Astronautics University of Electronic Science and Technology of China

Dear editor,One-round key exchange(ORKE)represents a special class of two-message key *** enables two parties to establish a shared session key within only one communication *** first merit of ORKE is its communication efficiency,particularly because two parties are able to simultaneously run the protocol ***,the messages of two session participants(in an ORKE protocol)are completely independent.

关键词： New constructions for multiparty Eph DDH PFS

A novel and efficient multiparty quantum secret sharing scheme using entangled states

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Science China(Physics,Mechanics & Astronomy) 2012年第10期55卷 1828-1831页

作者： MASSOUD Hadian Dehkordi ELHAM Fattahi School of Mathematics Iran University of Science and TechnologyTehran ***Iran

We proposed a novel and efficient multiparty quantum secret sharing scheme using entangled state which in that the number of parties can be arbitrary *** state which we used,has special properties that make our scheme simple and *** operations which are needed to recover secret message,are only exclusive-or addition and complement *** it is shown that this scheme is secure against *** this scheme provides the best quantum bit efficiency compared with some famous quantum secret sharing schemes.

关键词： quantum secret sharing entangled state multiparty quantum cryptography

Comparative Evaluation of Elliptic Curve Cryptography Based Homomorphic Encryption Schemes for a Novel Secure multiparty Computation

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Journal of Information Security 2014年第1期5卷 12-18页

作者： Sankita J. Patel Ankit Chouhan Devesh C. Jinwala Department of Computer Engineering S V National Institute of Technology Surat India

In this paper, we focus on Elliptic Curve Cryptography based approach for Secure multiparty Computation (SMC) problem. Widespread proliferation of data and the growth of communication technologies have enabled collaborative computations among parties in distributed scenario. Preserving privacy of data owned by parties is crucial in such scenarios. Classical approach to SMC is to perform computation using Trusted Third Party (TTP). However, in practical scenario, TTPs are hard to achieve and it is imperative to eliminate TTP in SMC. In addition, existing solutions proposed for SMC use classical homomorphic encryption schemes such as RSA and Paillier. Due to the higher cost incurred by such cryptosystems, the resultant SMC protocols are not scalable. We propose Elliptic Curve Cryptography (ECC) based approach for SMC that is scalable in terms of computational and communication cost and avoids TTP. In literature, there do exist various ECC based homomorphic schemes and it is imperative to investigate and analyze these schemes in order to select the suitable for a given application. In this paper, we empirically analyze various ECC based homomorphic encryption schemes based on performance metrics such as computational cost and communication cost. We recommend an efficient algorithm amongst several selected ones, that offers security with lesser overheads and can be applied in any application demanding privacy.

关键词： Elliptic Curve Cryptography Privacy Preservation Secure multiparty Computation

Quantum private query: A new kind of practical quantum cryptographic protocol

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Science China(Physics,Mechanics & Astronomy) 2019年第7期62卷 10-21页

作者： Fei Gao SuJuan Qin Wei Huang QiaoYan Wen State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Science and Technology on Communication Security Laboratory Institute of Southwestern Communication State Key Laboratory of Cryptology

This research aims to review the developments in the field of quantum private query(QPQ), a type of practical quantum cryptographic protocol. The primary protocol, as proposed by Jacobi et al., and the improvements in the protocol are ***, the advancements made in sability, theoretical security, and practical security are summarized. Additionally, we describe two new results concerning QPQ security. We emphasize that a procedure to detect outside adversaries is necessary for QPQ, as well as for other quantum secure computation protocols, and then briefly propose such a strategy. Furthermore, we show that the shift-and-addition or low-shift-and-addition technique can be used to obtain a secure real-world implementation of QPQ, where a weak coherent source is used instead of an ideal single-photon source.

关键词： quantum cryptography quantum private query quantum secure multiparty computation quantum oblivious key transfer quantum key distribution

Aggregation Tree Statistical Computing Based on Functional Encryption

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Wuhan University Journal of Natural Sciences 2019年第2期24卷 116-124页

作者： XIANG Guangli WANG Dengjia YU Benzhi LI Ankang College of Computer Science and Technology Wuhan University of Technology

The medical monitoring system is widely used. In the medical monitoring system, each user only possesses one piece of data logging that participates in statistical computing. Specifically in such a situation, a feasible solution is to scatter its statistical computing workload to corresponding statistical nodes. Moreover, there are still two problems that should be resolved. One is how the server takes advantage of intermediate results obtained through statistical node aggregation to perform statistical computing. Statistical variable decomposition technique points out the direction for statistical projects. The other problem is how to design an efficient topological structure for statistical computing. In this paper, tree topology was adopted to implement data aggregation to improve aggregation efficiency. And two experiments were done for time consumption of statistical computing which focuses on encrypted data aggregation and encrypted data computing. The first experiment indicates that encrypted data aggregation efficiency of the scheme proposed in this paper is better than that of Drosatos' scheme, and the second indicates that improving computing power of the server or computational efficiency of the functional encryption scheme can shorten the computation time.

关键词： tree topology multiparty statistical computation function encryption

Grand Multiparity: Obstetric Outcome in Comparison with Multiparous Women in a Developing Country

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Open Journal of Obstetrics and Gynecology 2017年第7期7卷 707-718页

作者： Charles Obinna Njoku Sylvester Etenikang Abeshi Cajethan Ife Emechebe Department of Obstetrics and Gynaecology University of Calabar Teaching Hospital (UCTH) Calabar Nigeria

Grand-multiparity is a serious risk factor in pregnancy and common in developing countries. The objective was to compare the obstetric outcome of grand-multiparous women with that of low parity in our center. The study comprised of 150 grand-multiparous women (cases) and 150 multiparous women (para 2 - 4) in this index pregnancy as controls matched for age and admitted for delivery. The mean age of the grand-multiparous women at delivery was 37.0 ± 2.8 years. Grand-multiparity was significantly higher among women with only primary education (48.0% versus 44.7%), polygamous marriages (9.3% versus 3.3%) and Muslims (17.3% versus 6.7%). Pregnancy induced hypertension and primary postpartum hemorrhage were significantly more often seen among grand-multiparous women than among the controls. The mean packed cell volume before delivery in the grand-multiparous women was significantly lower (33.6% ± 2.7%) than in the multiparous group (35.2% ± 2.7%) (P-value = 0.000). Grand-multiparity with its associated complications still occurs frequently in our environment. However, with adequate antenatal surveillance, optimal care during labour and contraceptive use, these problems will be reduced.

关键词： Grand multiparty Postpartum Hemorrhage Pregnancy Induced Hypertension Perinatal Mortality Nigeria

Private Personal Information Verification

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Journal of Information Security 2017年第3期8卷 223-239页

作者： Hoang Giang Do Wee Keong Ng School of Computer Science and Engineering Nanyang Technological University Singapore City Singapore

Physical document verification is a necessary task in the process of reviewing applications for a variety of services, such as loans, insurance, and mortgages. This process consumes a large amount of time, money, and human resources, which leads to limited business throughput. Furthermore, physical document verification poses a critical risk to clients’ personal information, as they are required to provide sensitive details and documents to verify their information. In this paper, we present a systematic approach to address shortcomings in the current state of the processes used for physical document verification. Our solution leverages a semi-trusted party data source (i.e. a governmental agency) and cryptographic protocols to provide a secure digital service. We make use of homomorphic encryption and secure multi-party computation to develop a series of protocols for private integer comparison and (non-) membership testing. Secure boolean evaluation and secure result aggregation schemes are proposed to combine the results of the evaluation of multiple predicates and produce the final outcome of the verification process. We also discuss possible improvements and other applications of the proposed secure system of protocols. Our framework not only provides a cost-efficient and secure solution for document verification, but also creates space for a new service.

关键词： Secure Computation Homormophic Encryption multiparty Computation