The company claims that the certification boosts consumer confidence, and can result in increased sales.
Under the terms of the deal, McAfee will pay US$51m up front and a further $24m based on certain performance targets.
McAfee plans to integrate Hacker Safe into its SiteAdvisor service to provide e-commerce ratings alongside its anti-phishing, anti-malware and anti-spam alerts.
"Through this acquisition, we will enhance McAfee's triple-play protection," said chief executive Dave DeWalt.
"This will create the industry's only service that helps consumers stay safe as they search, surf and shop."
The ScanAlert deal is the latest chapter in McAfee's quest to shift from an antivirus vendor into a major player in the broader security market.
The campaign has included the acquisition of SiteAdvisor in April 2006 and the US$350m purchase of SafeBoot earlier this month.
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iTnews Executive Retreat - Security Leaders Edition
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