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Anonymizer Defense

Block Anonymous Web Surfing and Proxy Sites

The Only Multi-Layered Solution that Stops Proxy Sites and UltraSurf
The iPrism Web Filter employs an unparalleled multi-layered approach that combines human-reviewed URL classification, deep packet inspection and unique proxy site blocking to deliver the most effective way to block anonymous web surfing protection on the market.

iPrism Web Filter's powerful anonymous web surfing and proxy site defense surpasses all competitors:
  • Spoofed SSL: iPrism detects and blocks anonymous internet traffic that tries to spoof secure traffic. This can occur because HTTPS (SSL) traffic on Port 443 is strictly enforced by default.
  • Dynamic Proxy Site Detection: With iPrism's on-the-fly proxy site detection administrators can run reports to show what anonymizers were blocked including proxy blocking of:
    • UltraSurf domain
    • The Google-web-accelerator domain
    • The http-proxy domain
  • Real-time Updates: Proxy URLs are collected and message groups are monitored daily for new anonymizers. These results are distributed via iGuard URL database updates as prequalified websites.
  • Active Domain IP Address Mapping: The ability to circumvent iPrism using IP addresses is blocked with this mapping feature. iPrism dynamically cross-references each IP address to its corresponding domain thwarting even the most sophisticated attempts to obscure Web surfing and access forbidden sites.

 Stronger Defense with Deep Packet Inspection
iPrism Web Filter employs artificial intelligence agents in the iPrism operating system to analyze patterns in the request URL. When the data forensics detects a suspicious pattern, it dynamically blocks access to the proxy site. The iGuard team also actively identifies unique and consistent patterns to assist in dynamic real-time classification. iGuard's current pattern list provides excellent coverage for proxy packages such as PHPProxy and CGIProxy. Pattern updates are published in the critical hourly filter updates to all iPrism customers.

iPrism's Unrivalled URL Blocking
iPrism's multilayered approach includes the powerful iGuard 100% human-reviewed database, which includes thousands of anonymous web sites that you can block through a simple category check. And because the iGuard database is continuously being updated, new anonymizer sites are identified and downloaded to your iPrism daily.

What are Anonymizers?

Anonymizers are web-based proxy servers that forward client requests to other servers. Their popular appeal lies in the fact that they remove identifying information of the user before they take them to a site.

The Threats Posed by Anonymizers
  • In schools and libraries, anonymizers are the most popular tool students use to access top social Web destinations such as YouTube, MySpace and Facebook, typically blocked by school IT staffs
  • CIPA violations resulting from anonymizer use by students can jeopardize a school qualifying for critical e-Rate funds
  • In the workplace, anonymizers give employees access to offensive or illegal content by making end-runs around corporate network defenses. Even if these events are isolated, they can precipitate costly and public lawsuits if co-workers are exposed to harmful content
  • Violations of acceptable use and security policies can have serious legal and regulatory consequences for organizations that fail to protect their workers from inappropriate content or data theft
  • Anonymizers create huge network security holes, hacker portals for data theft, spyware, viruses and worms
  • Anonymizer sites and fringe sites that offer illegal or offensive content often covertly deliver malware. Even if the original computer user logs off, the machine can start delivering offensive popups to other users who log on to that computer.