Internet Security:Internet security is a term that refers to the methods to protect data and information in the computer from unauthorized persons. It has become a serious issue in today’s world. People using the internet should be well aware of the problems aroused due to it. The common methods used by the people to ensure information in internet areEncryption of the data - Encryption of data deals with wrapping up the original information into an unintelligible form that can be decoded using a certain method. The encrypted form is called as cipher text. Usage of passwords - Passwords are used to prevent illegal access of data so that the whole system is secure. Construction of passwords should be in a way that the other people do not easily guess it.Methods:Several methods help in internet security. Some of them are listed below;1. Firewalls: A firewall is a software that filters illegitimate access in a network. It should have a proper configuration and has to be combined with proxy firewall for a secured system. 2. Taking Backup Of Data: Taking backup of the data from the system should be done regularly, at least the data that cannot be compensated. Suppose if the computer suddenly crashes down or the operating system failed to boot due to virus attack, taking backup of data will reduce the consequences. 3. Preventing Virus Attack: Computers may be affected by viruses, Trojan horse, worms etc due to some infected files downloaded from the internet. These viruses are nothing but programs that are installed by itself and run whenever the host programs run and cause malicious attack. The viruses either replicate or contain a buried function that affects the system files of the computer and leads to corruption of the operating system. Such viruses can be prevented by using anti virus software that detects and heal the virus in the system. These soft wares run on the background along with the other programs and prevent the intrusion of malicious attacks. 4. Baleful Links: People can prevent their system from getting affected by the virus by avoiding unnecessary links and emails. Certain links may lead to download files unexpectedly. These pose a problem to the security of the computer and hence should be avoided.5. File Sharing: During file sharing in the internet, pirated files also join with the original one and affect the speed of the computer. Hence, file sharing software should also be prevented. 6. Routers: Certain routers prevent connection from outside to the computer but allow outward connections. Network Address Translation is software that has the former behavior and it is of low cost and minimum complexity. 7. Preventing Spy-Ware: Several software forms a threat to the internet security. The software that runs along with other application without the permission of the user, gather information and send it to the software manufacturer through the internet. This is known as spy ware. Another soft ware called ad-ware works similar to that of a spy ware. In addition, it pops up advertisement during internet access and increases the CPU cycles, slowing down the computer.Internet as a Whole:It is better to disconnect the computer when it is not in use. Certain internet connection gets started as soon as the system is on. It should be avoided to make the computer spy free and can avoid many illegal attacks by the outsiders. Using antivirus and antivirus software alone will not prevent the intrusion of viruses. Personal caution is also required while using internet. Unwanted sites and attractive links have to be avoided. The antivirus software should be updated so that it is up to date. Hence, automatic updates should be activated. All this will make the system free from threats.

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