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ビジネス・IT（情報技術）分野_②専門課題：日本語→英語
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Realizing group orientated communication with network architecture

Introduction

In recent years, networking of various social activities has been taken up rapidly. This is due to the rapid development of information and communications technology, namely the increase in speed/lowering cost of information technology and the explosive growth of networking technology (especially Internet technology). Also, with the optimization and diversification of social activity, communication systems are becoming more diverse and sophisticated. For example, as well as networking, e-commerce, the trading and distribution of goods, and information appliances used in home security systems, have been put into practical use. Existing limits of the Internet are identified in order to meet the increasing needs of user networking. For example, as the Internet becomes an infrastructure for livelihood, while the user is able to connect to the Internet at a low cost, problems like spam, unsolicited or inappropriate information, and phishing, the leakage of private personal information, are growing. As the existing Internet connects an extensive range of users, if address information is disclosed, it is very difficult to prevent this kind of damage.

In these circumstances, the user's interest in the network changes from “connectivity/cost” to “safety/privacy”, and the necessity for safety and peace of mind in networking is raised. Therefore, I think that networks should be planned to provide safety and peace of mind from now on.

As for technology designed to solve the problem of Internet security, I think that ensuring the reach of users in specific groups (group-oriented communications technology) looks promising. The aim of this technology is to form groups, and limit the connectivity of outside users. From this, safe communication in groups is feasible. However, within groups, the number of users that can be connected is far less than the Internet. By forming groups, unnecessary information acquired by users (noise) is reduced on the one hand, whereas for the purpose of diversification, the information the user really wants to obtain (the signal) is “relatively” reduced. With this result, there is a problem with the decline in info S/N (signal to noise.)

While increasing security, in order to increase the info S/N, it is thought that it would be effective for the user to connect to multiple groups at the same time (multiple association). However, in practice it is difficult to associate a user with multiple groups using existing communication technology.

To solve this problem, a group-oriented communications multiple association model is proposed in this paper. With this architecture, a “web concentrator” is used to terminate multiple groups. The user's terminal is connected to the web concentrator. The web concentrator acts as a portal to aggregate content from multiple groups, and send the content to the end user. There are various technologies proposed for implementing groups, however a comparative evaluation of the appropriate requirements indicates that SSL-VPN is ideal for access networks for the web concentrator and user networks, and MPLS-VPN is ideal for the backbone network of the web concentrator.

Group-oriented communications technology

Group-oriented communications are indicated as communication systems based on communication of the logical collection of what becomes the communication entity (groups). Communication between various entities can be achieved by any combination of groups. Moreover, within identical groups, information leakage or unwanted information from outside the group is prevented. With group-oriented communication, various networks can be mapped naturally onto a variety of social activities.

Multiple association communications technology
To solve the problem of traditional group-oriented communications technology, several groups should be formed for the purpose of communication, whereby users to be able to simultaneously belong to multiple groups. When groups are closed, security is enhanced. Depending on the purpose, by selecting an appropriate group to belong to, communication will be possible with a high info S/N.

Requirements for group-oriented communication
When considering the safety and security requirements for end users, as a requirement for group-oriented communication, connectivity, versatility and security are considered.

Connectivity

With regard to connectivity, portability and scalability are required. In addition to the fixed terminal as a powerful entity in group-oriented communication, it is desirable to allow communication between various entities by allowing low-function mobile terminals and geographic mobility. For this reason, portability is required. As there also should be as many groups as possible to accommodate the entire network, and as the group needs to accommodate a large number of terminals, scalability is required.

Versatility

With versatility, there is a need to think in terms of layers and from a performance viewpoint. As group-oriented communication is available between entities and general applications, it is desirable to have a high affinity for the technology. Thus, group-oriented communication would be better realized with a lower layer. Also, it is desirable to have a high degree of performance with the use of visual and voice communication applications.

Security

Security requires closed networks and encryption. Group-oriented communication aims to improve security. By limiting the range of communication in a group, spam and phishing problems are eliminated. However, if closed networks are configured in an open network overlay, even if communication was limited within the group, there is the possibility of malicious users intercepting or altering communication within the group. Therefore, it is necessary to prevent such unauthorized communication. Therefore, we can say that group-oriented communication requires encryption of communications.

(Source: http://www.ispl.jp/~oosaki/papers/Takahashi07_IN5.pdf)