As if the security in airports and controls at border crossings weren't slow and intrusive enough, governments around the world are quietly passing laws to allow them to search the contents of your laptop and other electronic devices, like iPods and cellphones. A United States court last month gave border agents carte blanche to hold a laptop for days and even copy its entire contents. The UK government has given its agents authority to search computers at its borders for pornography. But in what may be the most baffling and cumbersome move of all, the US, Canada, UK, and other EU nations are working behind closed doors on a new trade agreement which could turn border agents into the copyright police.

Over the long weekend, the servers of the Internet TV site Revision3.com were brought down by what is called a "denial-of-service" attack (DoS)—one of the most common methods used to disrupt the operations of a Web site or server by flooding it with an overload of simultaneous connections. These attacks are not uncommon, but in a fascinating blog post written by Revision3's CEO Jim Louderback today, he reveals that the source of this particular attack was not a pimply basement hacker with a grudge, but a major anti-piracy organization called MediaDefender whose clients include all the major entertainment companies and the RIAA. The hitch? Revision3 is a perfectly legitimate business that does not deal in pirated content.

Terahertz radiation, or T-rays, can see through clothing, paper, cardboard and numerous other materials, so scientists have been touting their potential for years. A T-ray-based imager could spot concealed weapons hidden under a person's clothes or even identify tumors without inducing any bad side effects.

Google's CAPTCHA appears to have been cracked. On closer inspection, however, it seems Russian spammers have solicited humans to do the solving and to pass those accounts on to the computers. Websense Threat is reporting that one out of every five attacks of this kind on Google has been successful. Why is this an alarming development? Let's take a look at the CAPTCHA in order to understand.

Researchers at Princeton have discovered that with a can of duster and a laptop, it takes only matter of minutes to crack most encryption software, including BitLocker, FileVault, dm-crypt and TrueCrypt. The weak link that makes this ridiculously simple hack possible is the DRAM chip. Heres why: Any time your computer is on, that chip contains the key used to access encrypted data on your hard drive. Once that chip loses power, the bits stored on it are supposed to disappear immediately. But thats not really what happens.

In 2006, David Holtzman decided to do an experiment. Holtzman, a security consultant and former intelligence analyst, was working on a book about privacy, and he wanted to see how much he could find out about himself from sources available to any tenacious stalker. So he did background checks. He pulled his credit file. He looked at Amazon.com transactions and his credit-card and telephone bills. He got his DNA analyzed and kept a log of all the people he called and e-mailed, along with the Web sites he visited.

Every single American bank note is printed at Bureau of Engraving and Printing facilities, with ink and on paper each made, separately, in only one factory in the world. And yet at any given time, there is at least $70 million worth of fake U.S. currency floating around, 75 percent of which is in $100 bills. In large part because of the advent of inexpensive scanners and printers, more and more fake bills are entering circulation: From 1997 to 2007, the amount of passed counterfeit bills nearly doubled, to $64.9 million.

What do you think happens when you connect your computer to the Internet?