Security in a computer network Security in a Computer Network Security in a network can come in many different ways. There are basic needs that most networks provide, like Access control, and passwords. Data protection . Mail protection .
Many operation systems use a password mechanism to control access to the computer.
Each user has a login and a password, and whenever he wished to enter the computer, he needs to enter his password. We might need to encrypt the password, or find a way to use it safely. When the information is extremely sensitive, we might simply not allow to access it through the network. Sometimes we need to protect a certain file, so that it won't be available to all. The simplest use of encryption needs a key.