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

Nov 30, 2006

Corporate policies prohibit the unauthorized connection of hardware to the company network, threatening dire consequences in the case of non-compliance. Fair enough, but how do you actually go about catching somebody trying to plug an illegal laptop into your Ethernet?

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Crypto Tricks Intro Disk-level cryptography in Linux

Oct 31, 2006

Today’s computers are fast enough for some very sophisticated cryptography techniques. We’ll show you how to keep your data safe from the prying eyes of snoops and spies.

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Charly's Column TUNNELING THE DUTCH BEACHES

Sep 30, 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

Sep 30, 2006
Defeating the Hacker Designing Interfaces...
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Perl: Link Spam A Perl script protects forums against spam

Sep 30, 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

Aug 31, 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

Aug 31, 2006
Collaboration Explained Linux Patch Management Software Security: Building Security In...
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Bot_Attack An insidious spam botnet attacks Charly

Jul 31, 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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