Browse Definitions :
Definition

Bayesian filter

A Bayesian filter is a program that uses Bayesian logic , also called Bayesian analysis, to evaluate the header and content of an incoming e-mail message and determine the probability that it constitutes spam . Bayesian logic is an extension of the work of the 18th-century English mathematician Thomas Bayes.

Bayesian filters aren't perfect, but because spam characteristically contains certain types of text, such a program can be amazingly effective when it is fine-tuned over a period of time. A Bayesian filter works by categorizing e-mail into groups such as "trusted" and "suspect," based on a probability number (ranging from 0 or 0% to 1 or 100%). The categories are defined according to user preference.

Spammers are constantly trying to invent new ways to defeat spam filters. Certain words, commonly identified as characteristic of spam, can be altered by the insertion of symbols such as periods, or by the use of nonstandard but readable characters such as Â, Ç, Ë, or Í. But as the user instructs a Bayesian filter to quarantine or delete certain messages, the filter incorporates this data into its future actions. Thus a Bayesian filter improves with time, so it becomes more likely to block spam without also blocking desired messages.

Bayesian filters are best used in conjunction with anti-virus program s. Malicious viruses or worm s can occasionally appear as attachments to e-mail messages, even from trusted sources.

This was last updated in September 2005

Continue Reading About Bayesian filter

SearchNetworking
SearchSecurity
  • man in the browser (MitB)

    Man in the browser (MitB) is a security attack where the perpetrator installs a Trojan horse on the victim's computer that is ...

  • Patch Tuesday

    Patch Tuesday is the unofficial name of Microsoft's monthly scheduled release of security fixes for the Windows operating system ...

  • parameter tampering

    Parameter tampering is a type of web-based cyber attack in which certain parameters in a URL are changed without a user's ...

SearchCIO
  • e-business (electronic business)

    E-business (electronic business) is the conduct of business processes on the internet.

  • business resilience

    Business resilience is the ability an organization has to quickly adapt to disruptions while maintaining continuous business ...

  • chief procurement officer (CPO)

    The chief procurement officer, or CPO, leads an organization's procurement department and oversees the acquisitions of goods and ...

SearchHRSoftware
SearchCustomerExperience
  • clickstream data (clickstream analytics)

    Clickstream data and clickstream analytics are the processes involved in collecting, analyzing and reporting aggregate data about...

  • neuromarketing

    Neuromarketing is the study of how people's brains respond to advertising and other brand-related messages by scientifically ...

  • contextual marketing

    Contextual marketing is an online marketing strategy model in which people are served with targeted advertising based on their ...

Close