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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 cmx shopping more secure. This method involves encrypting and decrypting a cmx 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 cmx 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 cmx 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 cmx transactions if can be quite fiddly. Our recommended provider listed below makes it all much simpler.
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While the threat from hackers is low for individuals, a more serious threat to personal privacy comes from unscrupulous cmx companies that operate websites for quick quids. Many cmx sites require you to register before you can use its services. Often you must provide personal information, such as your name, street address, and e-mail address. Then as you browse the site, data is collected as to which pages you visited, how long you remained on each page, the links you clicked, what terms you searched, and so on. After a number of visits to the site, a personal profile emerges. The question is, what do cmx site operators do with this information?
Most claim that they use it to personalize your experience on the site. For instance, if a cmx site learns that you are interested in cmx, the next time you visit the site, you might be presented with an article or advertisements for that and related products. But some cmx websites sell this information to marketers, which means that you may find yourself receiving unwanted catalogs from garden suppliers. Our preferred retailer does not do this.
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