As the Linux operating system makes ever-deeper inroads into government data centers, agencies need to feel comfortable that the open-source computing infrastructures they're rolling out are indeed secure. In general, firewalls protect enterprise networks from intruders. But enterprises also require other types of protection in case a hacker gets past the firewall. Traditional Unix vendors have always provided added security at the operating-system level, including so-called "trusted" versions designed to provide data centers and security operations with machine-level security. These trusted versions defend against unauthorized access to data and applications.

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