架構在LDAP上之網頁分級服務機制

Abstract

隨著網際網路的普及化，生活上利用網際網路的現象也越來越多，而使用者的年齡層也越來越低。對於網路資訊內容的分級，對世界各國來說，目前已成當務之急。針對此一問題，國外提出了許多研究報告，而其中較具規模與影響力的是由W3C（World Wide Web Consortium）所推動的PICS協定（PICS, Platform for Internet Content Selection），內容包括完整的分級規格與方法，其為網路資訊的分級與搜尋，提出新的方向。但其對於分級資訊如何散佈與如何管理上卻稍嫌不足。藉由目錄服務概念的引入，以原本DNS（Domain Name System）的概念為基礎，利用LDAP（Lightweight Directory Access Protocol）技術建構PICS標籤伺服器（Label Bureau），提供分級資訊在存取與管理的優勢。 在本篇論文中，我們提出分級服務的架構，稱之為LDRS（LDAP-based Distributed Rating Service），解決了建構標籤伺服器時，分級資訊在儲存、效能與整合上所面臨的問題。此一分散式的架構提供網頁分級服務的環境，其配合網際網路的特性，透過目錄服務分散放置與集中管理等特質，對於網路文件分級資訊的散佈與管理有相當助益。最後，為了評估LDRS的效能，我們設計一增強型代理人伺服器（Enhanced Proxy Server）結合LDRS與代理人伺服器（Proxy Server）的功能作為分析和統計的依據。

On Internet today, surfing through WWW is very popular. However, much inappropriate information is transferred through Internet, so is useless information. PICS (Platform for Internet Content Selection) provides a systematic and complete architecture for Internet content rating system that includes methods for generating and distributing rating labels. But for distributing PICS rating labels, some issues about label bureau constructing should be solved. The directory service, which can provide functionality of distributed hierarchical data distribution, is adopted to solve these issues. In this thesis, we propose an LDAP-based rating service, named LDRS (LDAP-based Distributed Rating Service), which combines the advantages of LDAP (Lightweight Directory Access Protocol) to solve the issues faced as building a rating information distribution mechanism and construct a distributed environment for rating service. Finally, in order to evaluate the performance of LDRS, an enhanced proxy being further integrated with the functionality of LDRS is designed and implemented.