Tuesday, December 2, 2014

I don't use anti-virus software. Am I nuts?

Maybe I'm courting disaster, but my cheapskate approach to security has paid off so far. Here's my secret.



malware-warning.png
Declan McCullagh/CNET
I'm the on-call tech guy for family members, and most of my "repair" jobs involve clearing out malware infestations. You know the kind: hijacked browsers, rampant pop-ups, seriously impaired computer performance.
The irony is that there's usually some kind of security software running on their machines, be it McAfee, Norton, or the like. But after hearing me mutter under my breath about PEBKAC errors, I get the inevitable question: "Well, what security software do you use?"
Nothing.
Crazy? Crazy like a fox, thank you very much. This has been my modus operandi for years, and I swear on a stack of Wikipedias I've never had a single issue. No viruses, no spyware, no rootkits, no browser hijacking. No identity theft, no keylogging, no trojans.
Have I had to reset passwords following database breaches like this one? Of course. But that's beyond my control. What I can control is my own PC and how I interact with the Internet. After nearly a decade of running virtually no third-party security tools, here's the score: Broida, 1; Hackers, 0.
I realize this flies in the face of conventional wisdom, which insists you don't even boot your PC unless it's running a comprehensive security suite. Meh. I'm fine with it in principle, and obviously some users need it, but I balk at both the cost and the performance impact (though both have decreased admirably in recent years).

My Security Secret

How do I get away with this online offense, this browser blasphemy? There's no trick to it; it's just a simple trick.
My computer runs Windows 8, as secure an operating system as Microsoft has ever released. That's right, I said it. (Windows 7 was nearly as good, and I lived securely in it for years.) In addition to its built-in firewall, the OS offers anti-virus protection in the form of Defender (formerly the standalone Security Essentials), plus SmartScreen for protection from malware and phishing scams. Internet Explorer also provides plenty of safeguards against hijacking and the like, though I'm a Google Chrome user.
Speaking of which, all modern browsers -- IE, Chrome, Firefox -- employ robust security features of their own, and let's face it: your browser is the gateway to many, if not most, infections. Chrome, for example, will warn you about suspicious sites before letting you through to them, and its sandboxing helps prevent malware from "escaping" one tab and infecting all the others.
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Web of Trust helps alert you to potentially unsafe sites.Screenshot by Rick Broida/CNET
And that's it. Seriously. Between Windows, my browser, and my router (which has its own firewall, natch), I'm good. But there's one small add-on I do use, if only to buffer myself against momentary lapses of caution, and that's Web of Trust. It vets the search results displayed by Google and other engines, the idea being to prevent you from clicking through to a site that might be unsafe. Speaking of which...

Where Others Fail

Very often I find myself scratching my head, wondering how my relatives end up with such nasty incursions when I'm sailing along unscathed. The most likely answer: they're allowing it to happen, albeit unknowingly.
The two main culprits, in my opinion, are unsafe links (like the kind found in phishing e-mails) and spyware-infested downloads. One click of the former can steer you to a site that, just by viewing it, installs malware on your PC. As for the latter, many software sites are rife with ads masquerading as download buttons. You innocently click one, thinking you're downloading a particular program, but when you go to install it, bam: malware city.
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Did someone send you a SendSpace link? Better be careful which download button you click.Screenshot by Rick Broida/CNET
I feel especially guilty about this kind of thing, as I have occasionally steered users to freebie-software deals embedded on pages like these. Despite what I think are clear instructions, some folks invariably end up clicking in the wrong place.
The moral of the story, of course, is "look before you click." Whenever possible, mouse over a link to see where it's actually going to take you, and if the URL differs from what you'd expect, don't click. Likewise, steer clear of splashy "Download" buttons; very often the program you're after is accessible via a hyperlink, not a button.
Also, learn to recognize spam when you see it. Mail services like Gmail do a great job filtering out most of it, but sometimes an errant bit of junk gets through -- and very often it's a phishing message that can lead you to trouble.
Oh, and for heaven's sake, stop trying to download pirated music and movies. It's not only illegal, but also a surefire way to end up with malware.

What's Right for You?

Let me be clear: I'm not recommending that everyone ditch their security software and do like I do. I'm merely telling you what has worked for me. The simple combination of built-in security tools and some common-sense caution has kept my computers secure for years -- and for free. How do I know for sure? Every so often I run Malwarebytes Anti-Malware Free. Never so much as a blip.
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So far, so good.Screenshot by Rick Broida/CNET
My questions for you: what security software do you use, and has it been effective at keeping malware at bay? When was the last time it caught an incursion, and under what circumstances? Do you think I'm being an unsafe netizen, or are you intrigued by my approach?

Windows 10 takes a second swing at the future of Microsoft's OS




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     / Updated: October 29, 2014 9:20 AM PDT
Windows 10 is everything Windows 8 should have been. Now, it's still early: the technical preview is just a week old, and barely scratches the surface of what Microsoft has promised is coming down the pipe. It's also buggy, and definitely shouldn't be installed on your primary PC.
But this fledgling operating system is at once panacea and prescience, a remedy for Windows 8's identity-crisis that also rethinks and reworks the overly-bold approach to Microsoft's dream of unifying the desktop and mobile experience.

Fresh start

The revamped, customizable Start menu.Screenshot by Nate Ralph/CNET
Boot up a PC running the Windows 10 Technical Preview, and you'll be dropped off at the oh so familiar desktop. A taskbar with familiar looking icons sits on the bottom, and the recycle bin sits in the upper left corner. A build number sitting on the right side of your desktop is the only indication that this isn't Windows 8 all over again.
And then you press the Start button, and are greeted by the return of the Start menu. It's a proper Start menu too, with your apps all stacked in that endless column of nested folders we've all been scrolling since Windows 95. And sitting alongside that column are Windows 8's lovely Live Tiles, with news-bites and social updates spinning ad infinitum.
Windows 8 was a bold reimagining of the operating system, but the Start screen has proven contentious. The colorful Live Tiles offer useful notifications and information, but they were designed with touchscreen devices in mind: much of the work we do in Windows involves a keyboard, a mouse, and large displays chock full of windows and apps. Windows 8's Modern apps demand a full screen's attention, oblivious of our need to multitask. And many app developers have stuck to apps that rip us back to the desktop, creating a confusing experience for folks who want to make the most of Windows.
The Windows 10 Start Menu sidesteps those problems entirely, giving us the best of both worlds.

Old is new again

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Virtual desktops keep work and play separate.Screenshot by Nate Ralph/CNET
With Windows 10, the familiar and the new are mashed together in a form that's only a little different, but suddenly more useful than ever before. The new Start menu behaves much like older versions of Windows, with frequently used apps and any folders you've pinned lined up in a neat little column. To the right of that column are the Live Tiles, which function much like they do in Windows 8 in a fraction of the space. You pin apps as new tiles on a whim, and also resize and rearrange tiles to your liking. You can also resize the entire start menu, making it tall and narrow, or short and wide. And if you'd rather not deal with the Live Tiles at all, just right click them and remove them.
Press those Live Tile shortcuts, and the Modern apps introduced in Windows 8 open as classic windowed apps. This is a welcome change, allowing us to sample the new aesthetic Microsoft is pushing for the next generation of Windows without sacrificing our entire display. You can now drag these Modern apps around, snap them to half of your display, or minimize and maximize them at will.
Windows 10 lets you work smarter, too. Click the Task view button, and you'll get a quick glimpse of all of your open apps and windows. A black box running along the bottom of the display prompts to create a virtual desktop: that's a sort of private island that keeps everything you open there as an independent workspace. You can, for example, create one desktop for all of the applications you use for work, another to browse gaming forums or sites like Reddit, and yet another for games, or whatever you want.
The virtual desktop feature alone tempts me to install the preview on my primary machine. Of course we've had virtual desktops on Linux and Mac machines for years (and on Windows, from third-party apps), but it's nice to see Microsoft catching up here.
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Modern apps no longer take up the whole screen.Screenshot by Nate Ralph/CNET
In Windows 10, You can press Ctrl + Windows key to jump between your desktops, triggering a slick little sliding animation that was added in the latest build of the Technical Preview. You can also right click an app when you're in task view and select a specific desktop to move it to.
It's not completely there yet, however. I'd really like to be able to drag and drop open apps to different desktops instead of right click all of the time. And being able to rearrange the virtual desktops I've created would be a huge boost to my productivity.

A step forward

But Windows 10's real game-changing potential is still purely theoretical: this'll be one operating system to rule them all, serving up a device-specific interface that'll scale from desktops down to smartphones, and everywhere in between, with universal apps that will run everywhere too. Microsoft has also offered a look at new trackpad gestures that are slated to make their way into the Technical Preview.
Some of these gestures will likely be familiar to folks who've used the trackpad on a Macbook: swipe down with three fingers for example, and you'll minimize all of the open windows on your desktop. Swipe up with three fingers to reopen them. You'll also be able to jump between open applications by swiping three fingers to the left or right, if you'd rather not use the Alt + Tab shortcuts, or are on a device without a keyboard.
These features haven't yet made their way to the technical preview, but you'll eventually be able to pop a 2-in-1 convertible device like the Surface Pro 3 onto its keyboard base, and watch the full-screen Start screen melt away, offering instead the new Start menu and the familiar desktop.
That could be a cure for the confusing mess that is the current Windows 8 PC ecosystem, chock full oflaptops that bend over backward or split from keyboards, or simply graft touchscreens onto familiar designs. We should finally see an end to the jarring, generally unsatisfying experience that urges us to dance between the desktop and that weird, full-screen purgatory where Modern apps live.
And if you want to flirt with the Windows 8 experience you can do that too: just right click the taskbar and choose the option that disables or enables the Start menu. If Windows 8 had shipped with that option to begin with, we would probably have avoided this issue entirely.

Future-proofing

Windows 10 isn't going to fix everything, but a seemingly simple tweak to one of Windows 8's most divisive elements has made a world of difference to the OS. And that's crucial to Windows' future, as Microsoft is still looking at the big picture: PCs are old news.
Desktops and laptops still handle most of our work and play, but tablets and smartphones have long since stolen the limelight: future operating systems will need to work to bridge that gap. We've seen steps in this direction from Apple, with OS X Yosemite's ability to hand off files and things like emails and calls from your phone or tablet. And some Android apps are making their way to Google's Chrome OS, and interesting sign of where Google might be headed.
Microsoft's vision of tomorrow's ideal operating system is grander still. The goal is to offer a unified experience across devices of all shapes and sizes, and one that will morph to make sense: icons to tap and home screens when you're on a phone or tablet, but windowed apps and nested folders when you're armed with a keyboard and mouse.
Windows 8 dreamed of dragging us into that future, but we kicked and screamed at the inefficiency of its one-size-fits-all approach. With Windows 10, Microsoft seems to be getting it right.
I'll be running the Windows 10 Technical Preview and keeping tabs on major updates. Check out CNET's one stop shop for Windows 10 for more information on running the operating system, and be sure to check back here for more updates!

Appliance Science: The tasty physics of microwave ovens

How does a microwave oven heat without heat? Find out in the latest installment of Appliance Science, which delves into the physics of microwave ovens.



Colin West McDonald/CNET
Ever since humans first dropped a chunk of mammoth meat onto a fire and liked the result, we have been looking for new ways to cook things. One of the more recent developments in this race to taste is the microwave oven, which uses microwave radiation to heat and cook your food.
Because it uses less energy and is much quicker than a gas or electric ovens, the microwave has found a spot in most homes. In fact, it is thought that that by the beginning of the 21st century, over 90 percent of homes in the US had a microwave oven. That's pretty good progress for a device that was invented by accident 55 years ago.
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The original patent for the microwave oven, submitted in 1945.Google Patents
The microwave oven had its origins in radar research before and during World War II. As part of this research, engineers at Raytheon in the US built a large magnetron, a device that generates microwaves. While walking past a magnetron being tested, an eccentric engineer called Percy Spencer noticed that the radiation melted his candy bar. Intrigued, he used this device to cook popcorn and an egg. In the first (but by no means the last) microwave cooking accident, the egg exploded, showering an inquisitive colleague with egg and boiling water. Undeterred, Spencer attached the magnetron to a metal box, and the first microwave oven was born. The device was patented in 1945 by Spencer for the Raytheon Corporation.

Waves & microwaves

The secret of the microwave is in, well, the microwaves. As the name suggests these devices use microwave radiation, with a frequency of about 2.4GHz and a wavelength of about 4 inches (10.16 cm). Created in a device called the magnetron, these electromagnetic waves get water excited. When a microwave hits a water molecule, the molecule absorbs it. This excitement means it moves faster, and the water heats up. And hot water in your food means, as the heat spreads, hot food. This is why microwaves are so good at re-heating food: rather than heating the food from the outside like a normal oven would, they heat the water within the food, so it heats up quicker and more evenly. The microwaves also penetrate into the food, effectively heating it from within.
Of course, you don't want things outside the oven getting heated up, which is why they are made of metal. This metal cage traps the microwaves inside the oven: they bounce around from wall to wall until they hit something that can absorb them.
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Colin West McDonald/CNET
"But wait!" I hear you cry. "What about the door? That is made of glass that I can see through! Does that mean every time I look through this my eyeballs are being boiled?"
Fortunately, the answer is no. If you look closely, you'll see a grid of wires inside the clear glass door. These are connected to the metal walls of the oven, and block the microwaves from getting out. It is one of the odd quirks of radiation that if a hole is smaller than the wavelength of the radiation, most of it won't pass through the hole. So, to the microwaves, this grid of wires looks like a solid wall, and most of it keeps bouncing around inside the oven until it hits an excitable water molecule. It's the same reason why broadcast TV antennas made of grids of wire work: the grid looks like a solid surface to the radiation.
This is also the reason why microwaves are built so they won't work when the door is open, and why messing with this is a VERY BAD IDEA. Likewise, with all the tricks you see on YouTube about putting CDs or metal objects in microwaves. Cooking metal objects in a microwave is ANOTHER VERY BAD IDEA because the microwave can induce an electric current in metal. This current has got to go somewhere, and the easiest path between bits of metal is sometimes through the air (such as between the tines of a fork). This creates a plasma of ionized gas which can start a fire.
The reason you get the oddly beautiful effect when you microwave a CD is that the radiation induces a current in the metal, and the small holes that the data is stored on are just wide enough to create a strong electric current which arcs across the gap, melting the metal and the plastic coating. As the metal film that the data is stored on in the CD melts, the arc moves around the data track of the CD. But just to say it again, DON'T TRY THIS AT HOME, JUST WATCH IT ON YOUTUBE.
The microwaves themselves are created inside the magnetron. You can usually locate this in your microwave by looking for a plastic panel inside the cooking cavity. This panel covers the magnetron output, where the microwaves come from. The magnetron generates microwave radiation by bouncing electrons around inside a vacuum filled cavity that is exposed to a strong magnetic field. This magnetic field forces these electrons to circle around inside the cavity, absorbing energy. Eventually, this energy is released as a microwave. This microwave radiation is then gathered and directed into the cooking space of the microwave by a device called a wave guide.
Some ovens also feature a rotating metal fan (called the stirrer) which spreads the microwave beam to make it more random. This process of generating microwaves requires a very high voltage, usually in excess of a thousand volts (1 kilovolt). And that's another reason why you shouldn't mess with microwave ovens, as that voltage could easily kill you.* That's not why it is called a kilovolt, but it is a handy reminder of why you shouldn't take microwave ovens apart.
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Colin West McDonald/CNET
Once the microwaves are inside the cooking cavity, they bounce around until they hit something that can absorb them, such as a water molecule. Like waves in a bathtub, this reflection produces peaks (with lots of microwaves) and troughs with few microwaves, which scientists call a standing wave. This is why your microwave has a rotating dish in it, as this rotation makes sure that none of the food is sitting in a trough on this pattern, not being heated.
This is also why you need to be careful about both the food and the dishes you use in a microwave. If the food doesn't have any water in it, it won't absorb microwaves and it won't heat up. Many older plates and other dishes may contain some water or other materials that absorb microwaves, which means you'll end up heating the dish and not the food. The same is true of cracked or damaged dishes, where water can get into the crack and expand rapidly as it is heated, breaking the dish. In both cases, the results can be explosive, so only use dishes that are marked as microwave safe.

Wi-Fi is microwave too

One thing you might have noticed is that the 2.4GHz frequency of the microwaves used in microwave ovens sounds familiar. You'd be right: this is the same frequency as the 802.11g or n wireless routers you use in your home or office. Your Wi-Fi devices use the same frequency, but at much lower power: while a typical microwave oven can generate several hundred watts of microwave radiation, your Wi-Fi devices are emitting only a few milliwatts of radiation. That's not enough to cook sushi.
It does explain, though, why your Wi-Fi devices sometimes stop working when someone makes popcorn; although most of the microwave radiation is contained by the oven, a small amount escapes and can overwhelm the Wi-Fi signal. Newer Wi-Fi devices that use the 802.11ac standards don't have this problem, as they send and receive data at a higher frequency of 5GHz.

The future of microwaves

Microwave heating remains the most efficient way to reheat food, and there is nothing on the horizon at present that looks likely to challenge that. The basic mechanism of the microwave hasn't changed much in the past 40 years, since the development of the cavity magnetron in the 1960s. What has happened is that microwave ovens have got cheaper and cheaper, thanks to the increasing efficiency of manufacturing.
The cheapest microwave oven I could find on sale at the time of writing cost under $50. So, microwave ovens are likely to remain a mainstay of the modern kitchen for many years to come.* Pedants among you may point out that a high voltage won't kill you, but a high current will. As my physics teacher used to say, "It's the volts that jolts, and the mills that kills", because a high voltage won't kill you, but a small amperage (in the milliamp range) across the heart for a couple of seconds is enough to stop your heart beating and kill you. Either way, don't mess with big voltages.

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