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Until recently, people used a technique called symmetric key cryptography to secure information being transmitted across public networks in order to make i tune shopping more secure. This method involves encrypting and decrypting a i tune message using the same key, which must be known to both parties in order to keep it private. The key is passed from one party to the other in a separate transmission, making it vulnerable to being stolen as it is passed along. With public-key cryptography, separate keys are used to encrypt and decrypt a message, so that nothing but the encrypted message needs to be passed along. Each party in a i tune transaction has a *key pair* which consists of two keys with a particular relationship that allows one to encrypt a message that the other can decrypt. One of these keys is made publicly available and the other is a private key. A i tune order encrypted with a person's public key can't be decrypted with that same key, but can be decrypted with the private key that corresponds to it. If you sign a transaction with your bank using your private key, the bank can read it with your corresponding public key and know that only you could have sent it. This is the equivalent of a digital signature. While this takes the risk out of i tune transactions if can be quite fiddly. Our recommended provider listed below makes it all much simpler. i tune
It's always good to be familiar with the reputation of any i tune company you're dealing with. To find out more about a company most i tune websites have an ABOUT US section which will tell a little about the organization. Government agencies also monitor the activities of i tune companies to ensure that the goods and services they provide are acceptable to consumers. When you decide to purchase i tune online check out the CONTACT US section of the i tune website to ensure that you can actually contact them by phone, fax or email. Reputable firms will most certainly carry this information. How to shop for a Treadmill by: Paul Reeve Treadmills have become the hottest home exercise choice. According to the National Sporting Goods Association, treadmill sales have exceeded those of all other home exercise equipment. It's easy to understand why. Next to good shoes, a treadmill may be a runner's best friend. Practically anything your training demands--hills, intervals, tempo, long distance--you can do on a treadmill. And you can log those miles while watching Seinfeld or keeping an eye on your kids, without worrying about heat, cold, wind, ice, cars, darkness, potholes, mean dogs or scary people. Excited? Good. Now let's take your treadmill education another step and go treadmill shopping. Before we set out, though, a word of caution: Treadmills are expensive, and they're complex. A bad buying decision could leave you with one more inactive exercise hulk languishing in that musty corner of your basement. So tread carefully as we steer through the maze of buying a 'mill. First off, remember as with most things you get what you pay for. A $1,000 treadmill may serve you well, but a $3,000 machine is likely to perform better for a longer time. The following are some more specifics to absorb before you buy. How long should a home treadmill last? Retailers tell us the range is seven to 12 years, with 10 years about average. Of course, with proper care, some treadmills far exceed the average. With neglect, even the expensive ones die young. Dust is the primary early killer of treadmills, Once a week, take a dry cloth and wipe up any dust between the belt and deck. Also keep the floor around your treadmill clean and free of dust. What about the warranty? Generally, the longer the warranty, the higher the treadmill's quality--and price. Ideally you should look for a warranty of three years for parts and one year for labor, with dealer-provided in-home service for the first year. Most problems, if they occur at all, will crop up in the first 90 days. Mostly it will be relatively minor stuff, such as adjustment or replacement of a component. What's the difference between a "home" treadmill and a "club" model? Manufacturers often separate treadmills into two categories: "home" or "residential," and "club" or "commercial." Good home treadmills are essentially smaller versions of club treadmills. The high-end home treadmill can easily withstand regular daily use and features extensive programming options, often more than are found in the club treadmills. Club treadmills come with a superior warranty and a bigger motor that can take round-the-clock beatings. They also carry significantly higher price tags. What do horsepower ratings mean? Horsepower (h.p.) is a measure of motor power, and runners will want a 1.5 h.p. or higher "continuous duty" rating for their home treadmill, say most retailers. While higher ratings (2.0 h.p. or higher are common) do indicate a more powerful treadmill, your overall aim should be a machine that efficiently integrates the workings of the motor, belt and deck to give you a steady ride, which some 1.5 h.p. treadmills accomplish. Continuous duty means that the treadmill will run at its listed h.p. rating with a significant workload over extended periods of time--an important consideration.Be wary of manufacturers who list "peak-performance" h.p. ratings. It sounds impressive, but all peak performance indicates is a motor's maximum power, not its sustained output. What's the best belt size? To handle the long stride and natural side-to-side movement of runners, treadmill belts are expanding in width and length. Twenty-inch-wide belts are becoming common, and no belt should be narrower than 17 or 18 inches. The length of the running area should be at least 50 inches, with 55 to 60 inches preferable for taller runners. How important is the construction of the deck? Often overlooked by consumers (perhaps because it's hidden beneath the belt) is the treadmill's deck, or bed. Better-quality decks are usually made of thin layers of laminated wood, coated with lubricants to minimize friction between the belt and deck, which in turn reduces strain on the motor. The smoother the deck coating, the less friction between the belt and deck. Deck construction, more than the belt, influences how smooth or hard your treadmill feels to run on and how well it absorbs shock. You want a surface that gives a bit but doesn't bounce. Better decks are reversible, meaning they can be turned over--thereby (in theory, at least) doubling the life of the deck. Some decks require owner maintenance without which they may succumb in a year. Proper care, however, can extend a deck's life for the lifetime of the treadmill. AC or DC? Direct-current-driven (DC) motors power most home treadmills. DC motors start slowly, provide a more consistent response to speed, incline and weight demands, and tend to run quieter than alternating-current (AC) motors. With DC, you're dealing with fewer internal parts, which may cut down on repairs. AC motors, which tend to be found in club treadmills, start the belt at a faster speed. But you should be safe plugging either an AC or a DC motor into your wall outlet at home. Pricing A good home treadmill can cost up to $5,000 and will likely be the most expensive piece of exercise equipment you'll ever buy. Why so much money to run in place? To answer this, we contacted Cybex International, manufacturer of the high-end Trotter line. Companies that make the best treadmills install the highest grade of parts and components available, including expensive motors, safety and comfort features and long-lasting decks. Your treadmill's components have to be able to withstand a terrific beating--more than 1,000 footstrikes per mile of running. With the price of a high-end treadmill, you should get a machine that is absolutely durable, with a longer, more complete warranty that reflects its superior quality. If you're in the market to seriously educate yourself about treadmills, visit http://www.treadmilladviser.com where you can obtain more detailed information.
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