• Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

Chapter 5.7. Protecting Data > Virus Protection

Virus Protection

Viruses are a fact of life for modern computer systems. Some people talk about Trojan Horse programs (trusted programs that contain something unexpected. A virus is any program that propagates itself—an infect program becomes a Trojan Horse. Many viruses—perhaps the majority—do no harm to the systems they infect, but they still need to be removed. In a lot of cases, the cost of a virus is not the damage it does, but the time and bother involved in tracing and removing it. Hoax warnings of viruses also waste considerable quantities of people's time, so several of the suppliers of anti-virus software maintain Web pages that list the hoaxes.

Viruses are programs and they have to be executed to spread. A virus can't be spread on a pure data file, such as a GIF or TXT file. Macros blur the boundary between data and programs—most of the Microsoft Office suite of applications now support Visual Basic for Applications, and therefore are prone to virus attack. This is particularly worrisome because if a virus erases your hard disk, you know where you stand and can restore from a backup, but a virus in a spreadsheet program might make slight changes to data each time a file is used. Eventually, the file will be useless; so will many generations of it. Any version backed up will either be out-of-date, corrupt, or both.


PREVIEW

                                                                          

Not a subscriber?

Start A Free Trial


  
  • Creative Edge
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint