Charly's Column TUNNELING THE DUTCH BEACHES

Oct 01, 2006

What does Charly’s recent two-week vacation in Holland have in common with an SSH session? Nothing at all, at first sight. And therein lies a tale.

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Books

Oct 01, 2006
Defeating the Hacker Designing Interfaces...
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Perl: Link Spam A Perl script protects forums against spam

Oct 01, 2006

Spammers don’t just send email. They exploit discussion forums and blogs, posting pseudo-messages full of links to dupe search engines. A Perl script cleans up the mess.

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Charly's Column The Sysadmin’s Daily Grind: HTTP Antivirus Proxy

Sep 01, 2006

Browsers live in continual danger of compromise by a malicious site. An intermediate proxy combined with a virus scanner can help.

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Books

Sep 01, 2006
Collaboration Explained Linux Patch Management Software Security: Building Security In...
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Bot_Attack An insidious spam botnet attacks Charly

Aug 01, 2006

While going about his normal duties, Linux Magazine author Charly Kühnast was hit with a mean attack. Charly’s separate anti-spam server, which sits in front of his mail server, saved him from the mail storm.

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How to Write a Rootkit Rootkits for the Linux kernel 2.6

Aug 01, 2006

Today’s rootkits infiltrate a target system at kernel level, thus escaping unwanted attention from administrators. Read on for a practical look at how a kernel rootkit really works.

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Charly's Column The Sysadmin’s Daily Grind: Policyd

Jul 01, 2006

The Postfix Policyd plugin fights spam using techniques such as greylisting, source detection, volume measurements, blacklisting, and HELO rotation detection.

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