History of computer virus
For the first time the term virus has been used by Fred Cohen, who included it in his book Experiments with viruses to your computer ( Experiments with Computer Viruses ) , stating that he had been pronounced for the first time by Len Adleman .
The word virus had also appeared in science fiction novels (David Gerrold – When Harlie was one) and in film ( Westworld ) .
The virus first appeared on a computer in the world is ” Elk Cloner ” created by Rich Skrenta in 1982 on the Apple DOS 3.3 . The infection was spread through the use of floppy disks since, in those years, namely the late eighties and early nineties , the exchange of floppy disks were the main mode of spread of computer viruses.
With the spread of internet , however, the virus began to spread through the vast global network preferring, as software to infect, the various versions of Windows.
Windows system is absolutely the most affected by the virus , as the most widespread . However, those who have other operating systems (eg Mac OS ) are not totally safe , as new viruses are developed continuously, and not only for Windows systems .
However , the solution to adequately protect against virus attacks , whether they are traveling through the network , or using mass storage devices to spread , is represented by the antivirus .
The antivirus software is a normal ( well you can find it at any computer store ), which, once installed on your computer , performs the functions of controlling the entire operating system to assure the user that the computer is free from any type of virus in circulation. When a virus is spread , you will need to strengthen its anti-virus , download the updates that will make it even more efficient.
But not always the antivirus do their job . In fact, many modern antivirus are passed over by several viruses , including the virus because they are not all the same, as regards their ability to protect the operating system .
What is a computer virus ?
A computer virus is a small software whose task is to continually multiplying damage files on the computer without the user being aware of what is going on.
Most viruses act on the operating system acting on its capacity ; in practice, the viruses create very large programs in such a way as to fill the computer’s memory.
Usually a virus simply acts on the software of the computer that hosts ; however, it can be damaged also the hardware , as the virus can block the cooling fan or the same speed by overclocking.
Viruses diffuse through e-mail or via instant messaging software , and thus a very important advice to protect yourself from viruses is to never open links that do not know or that are sent to us by unknown persons.
The virus can also be contained in the images, or audio of movies , not to mention of course the download on the internet, without a doubt the easiest place in which to be attacked by a virus. These can also be contained in a mass storage device , so even if a computer has no connection to the Internet , we must thoroughly check all the devices that are connected.
All viruses are not executable programs (such as can be, for example , games ) . They need to infect a host program in order to multiply .
When the executable program is started, the virus creates an instruction that causes the program to create , first of all , a copy of the virus, in order to activate it, and then sends running the program in a normal manner ; In this way the virus is active and begins to carry out the operations for which it was created, while the user continues to use the program launched without noticing anything .
So viruses are divided into two types, namely those that are found on magnetic media, or those aggregates because they related to programs, and those present in RAM, already active