Computer security principles and practice william stallings pdf free download


This is the latest accepted revision, reviewed on 8 December 2017. Infected computer programs can include, as well, data files, or the “boot” sector of the hard drive. When this replication succeeds, the affected areas are then said to be “infected” with a computer computer security principles and practice william stallings pdf free download. Virus writers use social engineering deceptions and exploit detailed knowledge of security vulnerabilities to initially infect systems and to spread the virus.

Computer viruses currently cause billions of dollars’ worth of economic damage each year, due to causing system failure, wasting computer resources, corrupting data, increasing maintenance costs, etc. In response, free, open-source antivirus tools have been developed, and an industry of antivirus software has cropped up, selling or freely distributing virus protection to users of various operating systems. The term “virus” is also commonly, but erroneously, used to refer to other types of malware.

The majority of active malware threats are actually trojan horse programs or computer worms rather than computer viruses. The term computer virus, coined by Fred Cohen in 1985, is a misnomer. However, not all viruses carry a destructive “payload” and attempt to hide themselves—the defining characteristic of viruses is that they are self-replicating computer programs which modify other software without user consent.

The first academic work on the theory of self-replicating computer programs was done in 1949 by John von Neumann who gave lectures at the University of Illinois about the “Theory and Organization of Complicated Automata”. The work of von Neumann was later published as the “Theory of self-reproducing automata”. In his essay von Neumann described how a computer program could be designed to reproduce itself.

Von Neumann’s design for a self-reproducing computer program is considered the world’s first computer virus, and he is considered to be the theoretical “father” of computer virology. In his work Kraus postulated that computer programs can behave in a way similar to biological viruses. The Creeper virus was first detected on ARPANET, the forerunner of the Internet, in the early 1970s.


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