As spammers dream up new strategies for slithering into e-mail inboxes worldwide, their counterparts, anti-spam software developers, are always on the lookout for new ways to stop them cold. A bevy of companies think they may have a good answer in challenge-response technology.
The tactic is a simple one, requiring an e-mailer to verify his or her identity before being added to a "white list" that enables him or her to send e-mail unrestricted in the future, but the technology is not perfect yet. Some anti-spam advocates fret that the technique is too cumbersome or not entirely effective. However, amid a surge of user desperation nearly as powerful as the flood of spam sweeping across the Internet, the tactic's growing popularity speaks for itself. Will challenge-response emerge as the next big spam killer?
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