Linux distributor Red Hat has discovered a vulnerability in the GNU "tar" program that could allow attackers to overwrite files.

The user rules in Linux – if you know where you’re going. This month the trail leads deep into the Linux Bluetooth stack.

Spammers charge real money for their dubious services, and hundreds of advertisers are willing to pay. We’ll show you some innovative techniques for controlling and containing spam, including strategies for slowing down spam bots, keeping spammers from getting your address, and separating spam from legitimate email.

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?

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.

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.

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.