Your Linux system may not be so airtight after all. To understand the threats, you need to think like an intruder. We'll show you what the intruders are thinking now about the Linux 2.6 kernel.

Security Enhanced Linux or App Armor? Linux Magazine invited two well-known personalities from Red Hat and Novell to debate the merits of their security systems.

SELinux provides a comprehensive Mandatory Access Control system for Linux, if you are ready for all the details.

In last month’s issue of Admin Workshop, we introduced tools that help admins get services up and running. This month, we will show how you can use the Ident protocol to associate a user name with a TCP connection.

Anonymous remail protects the sender’s identity against potential eavesdroppers. The Mixmaster protocol gives users a mature technology for anonymous remail, and the text-based Mixmaster client is an example of a free remailer application.

Socks is a universal proxy protocol for TCP and UDP that allows internal hosts to securely pass the firewall and authenticates users. This article describes the latest version of the Socks proxy protocol and shows how to implement it.

Content filters protect a web user’s privacy and keep the flood of unsolicited advertising at bay. We’ll show you a pair of popular Open Source content filters.

A new form of phishing attack deposits an HTML tag on the vulnerable service to trap users into authenticating.