Data security-threats and countermeasures

The advances made by malicious hackers and some current and future means of prevention are examined. The various strains of computer viruses are described. Among these are new types such as stealth and polymorphic viruses, which are difficult to detect. The growing use of Virus Exchange Bulletin Boards, which promote the technology of writing difficult viruses, is discussed. The particular vulnerability of local area networks is examined. Protective measures, many of which cost little, are described.<>