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<span>A key is data called that is input into a cryptographic algorithm for the purpose of producing encrypted data. There are two types of cryptography, the public key and the private key. The public key uses public keys to encrypt data and private key uses private key to decrypt data. They are produced by a group of algorithms. </span>
If there is an about page where it tells whom made the website, as well as a copyright 2016 on the bottom of the page. This basically means the website is useful and updated by the creators. Another factor which the site doesnt always need but if it has an https at the beginning of the url then it should be good and valid because that means the site is secured. Also factor in the sections where articles are present, if they have a date and an author towards the bottom or top of the article, then it can be trusted as well. Theres a lot more you can look for in a site and validating if it is an okay site but these are a few examples. Hope this helped!:)