Virus Is The Program That Is Able To Reproduce
How computers began to be ill
Computer viruses have been mentioned for the first time in the late 1980-s. They have appeared due to several factors. The first of them is the increasing distribution of personal computers. Before 1980 practically nobody has had computers at home and they have been considered like toys. The real computers have been extremely rare, and they were accessible only for use by experts. And at the beginning of 1980-s desktop computers have begun to extend and the number house and business – users has considerably increased. It is connected with accruing popularity of the personal COMPUTER produced in 1982 by IBM and of the Apple Macintosh made in 1984. And by the end of that decade computers have been widely presented at offices, colleges and apartments.
The second factor – use by users of systems of a teleconferencing to open access for data transmission (so-called «bulletin board» – forums). The person dials a phone number and by means of the modem downloads various types of programs. Games have been especially popular, also primitive text editors, spreadsheets, and also other software however has had success. Forums have served as the reason of the subsequent creation of such viruses as “Grecian horses”.
These have been programs with loudly sounding name and the attractive description that is why they have been willingly downloaded. However starting work with this PC there has been something absolutely not pleasant: the data from a disk, for example, has left. You think that have received fascinating game, and actually the program erases your system. Fortunately, “Grecian horses” have done much harm to a small number of users as they have soon been found out, removed in a maximum quantity, and among programmers the hearing about their danger has been widely known – people have become more vigilant.
The third and very powerful factor of distribution of computer viruses has become a floppy-diskette.
In 1980 programs have been small that is why it has been possible to place on one 3,5 ’ magnetic disk all operating system and even pair of programs and documents. Many computers have been deprived of hard disks, and because of this at their inclusion all has loaded from a diskette. Here founders of viruses also have decided to take advantage of the arisen advantage and began to write the first self-reproduced programs.
The first viruses have been the part of a code attached to the normal program like a game or a popular word-processor. The user has downloaded the infected software from a network and has started it. Then a virus, the small harmful part of the big code of the healthy program, has loaded into memory and has searched for other programs on a disk. In case of finding, the program has been modified by it by addition of a virus code. After that this it starts. The user does not have possibility to find out, whether viruses are activated, and unfortunately, the infection has already been reproduced and two programs have become spoilt already. Next time these programs infect others and thus the cycle proceeds.
If the infected program is transferred to other user on floppy or has been loaded to a forum, the weight of other programs also will be infected.
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