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Web based distribution of multimedia digital content has been accelerated due to the increase in the use of the Internet. The major issue regarding the design of a multimedia digital content distribution system through the web is to guarantee the security of digital content and to supply a large amount of high quality multimedia digital content to users. This study focused on designing a security technique for each group in a multilayered structure, and on a caching technique, which is based on this security technique, and to improve the user's response speed. Using these techniques guarantees the security of digital content distribution. We implemented the prototype and verified the performance of the proposed system through testing.

Generally, as for the multimedia high quality contents, an illegality facsimile is possible without a damage of a quality. Also a distribution of contents duplicated illegality in an Internet is giving a great economic loss to digital contents provider. Therefore, a study for security and efficient distribution of digital contents is required. The most important issues in a design of digital contents distribution system are a user convenience, an execution speed and a security. In this study, we designed digital contents distribution system that used a web caching technology and an encryption/decryption technique on hierarchical structure. The proposed system was the digital contents distribution system that improved a security and execution speed, a convenience of a user. Also it verified performance superiority of a proposed system by an examination.

The key features of mobile agent systems are mobility, autonomy, and intelligence. On integrity protection within mobile agent technology, mobile agent integrity should be protected against attacks from malicious hosts and other agents. In this paper, we design flexible Mobile Agents (FMA). The traditional mobile agents consist of fixed code parts. But FMA consist of flexibly upgradeable agent code part for that new agent code modules can be added and redundant code modules can be deleted on the executing requirement. FMA prove to be more flexible in agent-based web systems compared to the traditional static-type mobile agent.

In this study, an e-commerce system with the capability of web cache based on the split area in a hierarchical structure is designed. The performance is then assessed through experiment. The local server for the proposed system is a duplicated server for the e-commerce system. The advantage of location improves the latency time. The system's response speed is also improved due to dispersion of the entire systems load. The performances of the system and algorithm are analyzed with an experiment. With these experiment results, the algorithm is compared with previous replacement algorithms.

Until now, various web caching replacement algorithms related to this were researched. An aggravation of web object heterogeneity more frequently generates a replacement of a web object, but cannot reflect enough all kinds of characteristics of web object in these traditional replacement techniques. Especially size heterogeneity of an object has an influence on performance of a web caching seriously. Therefore, a study on web caching algorithm with size heterogeneity of an object is required. In this study, we proposed a web object replacement algorithm with heterogeneity of a web object for performance improvement of the response speed. The algorithm is designed with a divided scope that considered size reference characteristic and reduced size heterogeneity on web object. The performance of the algorithm is analyzed with an experiment. With the experiments results, the algorithm is compared with previous replacement algorithms, and its performance is confirmed with 10%-20% elevation of object-hit ratio and an improvement of response speed.

A web caching technology, which analyzes and reflects the reference characteristics of users, is required to effectively operate an electronic commerce system, because the reference characteristics of web objects becomes a major factor in decreasing the performance of an electronic commerce system. Therefore, it is necessary to study the increase in the performance of web caching based on the probability distribution of the object reference characteristics in order to increase the performance of an electronic commerce system. This paper proposes a web caching method based on the probability distribution of the object reference.

Regarding the design of a multimedia digital content distribution system, the important issues are to supply a large amount of multimedia digital content to users and to guarantee the security of digital content. In this study we proposed designing a security technique for each group in a multilayered structure, and on a caching technique, which is based on this security technique, and to improve the user’s response speed. Using these techniques guarantees the security of digital content distribution.