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URL Filtering



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URL filtering is a critical piece of Web security. However, categories alone are not enough to provide complete protection. Uncontrolled access to Web content brings about regulatory violations, legal risks, security breaches, lost productivity, and ultimately, significant lost time and dollars. While manually compiled lists are no longer an efficient option, they do provide valuable intelligence into the historic behavior of Web sites. This is particularly useful in outbound policy and compliance control, increasing employee productivity and improving the safety of company resources. Did You Know? 50% of Web visits go to the top 20 million sites. The other 50%, and most enterprise traffic, goes to the remaining 450 million “less popular” sites. Any given Web site has an average of 50 objects per page and static URL filtering solutions classify it as whole. Problems with URL Filtering: 10-year old technology Created for policy, not security Manual process, not automated Based on Web crawlers, not what is relevant or actual content on the page Classify the head of ~20M sites, leaving the Long Tail completely exposed WebSafe powered by Purewire Web Filtering WebSafe powered by Purewire’s Web filtering integrates powerful URL filtering analysis, including more than 100 million active Web sites, with real-time reputation scoring and content analysis. The database is updated daily with newly categorized sites and provides a real-time feedback loop to increase accuracy. Purewire’s Dynamic Response Classifier™ is a real-time dynamic classification engine that picks up where traditional URL filtering databases leave off, to address the remaining unclassified sites or the “long tail” of the Web. The Purewire Dynamic Response Classifier operates in real time as part of the proxy, reviews response traffic, and dynamically classifies Web sites based on the actual content of the page. Purewire analyzes HTTP header information, page content and embedded links in order to achieve a more holistic review of the site’s safety and intent. This allows for a richer, more complete view of what’s actually happening on the page and closes the gap that static, database-driven URL filtering solutions leave behind. Unlike static URL filtering lists, Purewire’s fluid technology allows Web sites to move within a continuum of “dangerous” to “safe” based on changes in behavior. Thus, a site that has been compromised and assigned a “dangerous” rating can be redeemed after all traces of malware have been removed. Purewire uses this reputation scoring to ensure that even if a site is not classified as something that should be blocked based on policy, it is blocked if it is a security risk.