DHAShort for Directory Harvest Attack, DHA is a type of malicious Internet attack where online spammers collect valid e-mail address and target those addresses in a spam attack or sell the lists of valid e-mail addresses to unscrupulous marketers. In a DHA attack, the spammer will select a domain name, for example, Webopedia.com. The spammer then sends an e-mail to any possible addresses within that domain name. If the e-mail server doe not reject the e-mail, the spammer knows it is a valid e-mail address and adds it to his target list.
Stay up to date on the latest developments in Internet terminology with a free weekly newsletter from Webopedia. Join to subscribe now.
We look at a few of the more troubling aspects of statistics and how these may be used to advance an agenda or skew the facts to someone's... Read More »29 Free Android Apps for Cash-Strapped Students
From wacky alarm clocks to lecture hall tools and after class entertainment, these Android apps are a good fit for a student's life and budget. Read More »Sharing Threat Intelligence
A growing number of startups make the sharing of threat intelligence a key part of their solutions. Read More »
The Open System Interconnection (OSI) model defines a networking framework to implement protocols in seven layers. Use this handy guide to compare... Read More »Network Fundamentals Study Guide
Networking fundamentals teaches the building blocks of modern network design. Learn different types of networks, concepts, architecture and... Read More »Computer Architecture Study Guide
This Webopedia study guide describes the different parts of a computer system and their relations. Read More »