What is the difference between viruses,worms and trojans?
It was not hard to classify all malicious programs that existed until the end of the 90s but these days it’s not easy because many different maleficent programs exist.The first virus was inoffensive and didn’t have destructive payload,it was created for the sole purpose of spreading but soon after it viruses with destrucive payloads were produced.Year after year more and more such viruses were being written which made people think they’re all bad and that’s why all viruses are nowadays considered harmful.Worms,trojans and other malicious programs were created… Many people don’t see a difference between viruses,worms and trojans but there is such and it’s essential.Virus is a self-replicating program containing code which copies itself and which can infect other programs by modifying them or their environment so that a call to an infected program will be a call to a copy of the virus too.Unlike viruses,worms don’t attach themselves to other programs in order to propagate.They are able
What is a virus? A computer virus is a small program written to alter the way a computer operates, without the permission or knowledge of the user. A virus must meet two criteria: • It must execute itself. It often places its own code in the path of execution of another program. • It must replicate itself. For example, it may replace other executable files with a copy of the virus infected file. Viruses can infect desktop computers and network servers alike. Some viruses are programmed to damage the computer by damaging programs, deleting files, or reformatting the hard disk. Others are not designed to do any damage, but simply to replicate themselves and make their presence known by presenting text, video, and audio messages. Even these benign viruses can create problems for the computer user. They typically take up computer memory used by legitimate programs. As a result, they often cause erratic behavior and can result in system crashes. In addition, many viruses are bug-ridden, and
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