Applying two channels to vector space secret sharing based multi-signature scheme

Secret sharing and digital signature is an important research area in information security and has wide applications in such fields as safeguarding and legal use of confidential information, secure multiparty computation and electronic commerce. But up to now, study of signature based on general vector space secret sharing is very weak. Aiming at this drawback, the authors did some research on vector space secret sharing against cheaters, and proposed an efficient but secure vector space secret sharing based multi-signature scheme, which is implemented in two channels. In this scheme, the group signature can be easily produced if an authorized subset of participants pool their secret shadows and it is impossible for them to generate a group signature if an unauthorized subset of participants pool their secret shadows. The validity of the group signature can be verified by means of verification equations. A group signature of authorized subset of participants cannot be impersonated by any other set of partici- pants. Moreover, the suspected forgery can be traced, and the malicious participants can be detected in the scheme. None of several possible attacks can successfully break this scheme.

Dynamic Vector Space Secret Sharing Based on Certificates

A vector space secret sharing scheme based on certificates is proposed in this paper. The difficulties of solving discrete logarithm assure confidential information＇s security, and the use of each participant＇s certificate makes the dealer have no need to transfer secret information to the participants. The proposed scheme is dynamic. It can effectively check cheaters and does not have secure channel requirements.

Narratives of Spatial Division： The Role of Social Memory in Shaping Urban Space in Belfast

The paper examines the role of shared spaces in divided cities in promoting future sustainable communities and spaces described as inclusive to all. It addresses the current challenges that prevent such inclusiveness and suggests future trends of its development to be of benefit to the wider city community. It explains how spaces in divided cities are carved up into perceived ownerships and territorialized areas, which increases tension on the shared space between territories; the control of which can often lead to inter-community disputes. The paper reports that common shared space in-between conflicting communities takes on increased importance since the nature of the conflict places emphasis on communities＇ confidence, politically and socially, while also highlighting the necessity for confidence in inclusion and feeling secure in the public domain. In order to achieve sustainable environments, strategies to promote shared spaces require further focus on the significance of everyday dynamics as essential aspects for future integration and conflict resolution.

Research on the Renewal Strategy of Social Space for the Elderly in Colleges and Universities from the Perspective of Multi Generations:Take a University in the North as an Example

Under the background of population aging,while the living environment of the elderly is improved,it is necessary to pay attention to their spiritual needs and build an elderly-friendly and livable social environment.In this paper,through field investigation and research on social behavior and space,the social behavior and needs of the elderly in a university in the north were analyzed,and based on the social characteristics and psychological needs of the elderly and students in the university,the construction of a dynamic space with multi-generational shared space as the core was proposed to develop a social platform that integrates virtual and reality,so as to provide reference for the updating of social space in college communities in the future.

Beyond Public Spaces： Shared Spaces in the Contemporary City

The text aims to investigate the relevance of the concept of＂public space＂ and the continuous variations which have changed its meaning. Going beyond the concept of public space, the author can understand the semantic boundaries of this definition： Today, relational spaces and shared spaces are the forms with which people can express the concept of public space. The gradual spread of new forms of communication has transformed the static view of public space in a more dynamic condition, the distinction between square, street, garden has lost its meaning leaving space to fragments and residues. Contemporary public spaces are defined, as the residual places that come from the abandonment of industries. The large mono-functional voids, which originate from industrial dismantlement, should be strategically reconsidered as new shared public spaces, where the integration between different functions leads to reactivate new forms of re-using of built space.

Effects of outdoor shared spaces on social interaction in a housing estate in Algeria

This study aims to identify how the characteristics of shared outdoor spaces in housing estates influence residents to interact with one another. The study specificalty focuses on a housing project catted la cite des 1000 logts, which is situated in a zone d＇habitat urbaine nouvelle in Biskra, a city in South Algeria. The investigation draws on two sources of information, observations of the ways in which the residents use their neighborhood spaces and a questionnaire survey with residents about the perceived adequacy of these spaces for social interaction. Data for the survey was collected from the owners of fiats in the apartment blocks surrounding the open spaces. Housing samples were taken from a total of 1000 housing units identified within the study area. Twenty five percent （25%） of the total housing units were selected. Out of the 250 questionnaires administered to household-heads who were the respondents, only 230 were subsecluently retrieved for data anatysis. Results showed that the high degree of ＂openness＂ of la cite des 1000 logts and the poor quatity of communal outdoor spaces in the area discourage art forms of spatial use and reduce these outdoor spaces to transit areas. Furthermore, findings indicated that the layout of buildings and the quality of common outdoor spaces in residential neighborhoods substantially affect the use of these spaces and the social interaction among residents.

Secure Sensitive Data Sharing on a Big Data Platform

Users store vast amounts of sensitive data on a big data platform. Sharing sensitive data will help enterprises reduce the cost of providing users with personalized services and provide value-added data services.However, secure data sharing is problematic. This paper proposes a framework for secure sensitive data sharing on a big data platform, including secure data delivery, storage, usage, and destruction on a semi-trusted big data sharing platform. We present a proxy re-encryption algorithm based on heterogeneous ciphertext transformation and a user process protection method based on a virtual machine monitor, which provides support for the realization of system functions. The framework protects the security of users＇ sensitive data effectively and shares these data safely. At the same time, data owners retain complete control of their own data in a sound environment for modern Internet information security.

空间共享与共享空间——来自南京的案例研究

Sharing practices are emerging phenomena in the 21st century.The existing literature mainly focuses on sharing practices such as sharing economy,bike-sharing schemes,food sharing,and co-housing regarding the social,cultural,political,and organizational dimensions,while space sharing has been under-investigated.By taking a qualitative case study approach,this paper mainly examined the socio-spatial dimensions of sharing practices through the lens of sharing urban public spaces by neighborhood residents.To better understand how shared spaces are formed and how shared spaces facilitate sharing activities,a public space in a historic neighborhood in Nanjing was selected as a case.Taking account of a specific urban context,the research aimed to understand place-based sharing practices in as many ways as possible.The research findings revealed that the appropriate physical conditions of the public space are the prerequisites for space sharing.In turn,space-sharing practices could enhance the sense of community and social cohesion.However,some negative effects,such as homogeneity in social groups and privatization of the public space were identified as well.The implications for policy-making and planning practice were also provided.

Architectural and personal influences on neishborin8 behaviors;

Architectural and personal influences on neighboring behaviors were studied in a residential neighborhood using both qualitative informal conversations, and systematic recording of activity in the neighborhood＇s social space. This dual approach produced new insights into neighboring behaviors and social networks. It was discovered that the residents who participated in the social space were only a portion of the resident population. There was an additional neighborhood-based network whose neighboring was not conducted in the social space; instead it was maintained by direct house-to-house contact. It was also found that some individuals chose not to participate in any neighborhood social network. The social space was an effective neighboring venue for those residents who chose to use it, but did not attract commingling of groups. Contrary to an assumption in previous neighboring research, there are social groups which develop and maintain themselves without participation in a social space.

A Computer-Aided FPS-Oriented Approach for Construction Briefing

Function performance specification (FPS) is one of the value management (VM) techniques developed for the explicit statement of optimum product definition. This technique is widely used in software engineering and manufacturing industry, and proved to be successful to perform product defining tasks. This paper describes an FPS-oriented approach for construction briefing, which is critical to the successful delivery of construction projects. Three techniques, i.e., function analysis system technique, shared space, and computer-aided toolkit, are incorporated into the proposed approach. A computer-aided toolkit is developed to facilitate the implementation of FPS in the briefing processes. This approach can facilitate systematic, efficient identification, clarification, and representation of client requirements in trail running. The limitations of the approach and future research work are also discussed at the end of the paper.