What VPNs are?
This is a networking technology that can extend over a public network or not controlled, such as the Internet. For example, to connect two or more branches of a company through the Internet, members of the support team can access the computer center from home, and a user can enter your home computer from a remote site as a hotel.
Because these processes run on the Internet infrastructure, it is necessary to confirm their safety through the media to ensure the authentication, integrity and confidentiality of communication.
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Authentication and authorization: Who is the other side? What level of access must be users or computers?
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Integrity: Ensuring that data were not altered.
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Confidentiality: As data travels through a medium such as potentially hostile Internet, information is more likely to be intercepted. It is therefore essential data encryption. Thus, they will be interpreted only by the addressees.