08/25/2011 11:02 am ET Updated Oct 25, 2011

Allianceforbiz Hacker Dumps Data From 20,000 Customers, U.S. Employees

A solo attacker has hacked into an events management company and obtained sensitive information belonging to 20,000 individuals, many of whom were United States government employees or contractors.

The cyber-attacker posted an Excel spreadsheet containing log-in credentials and personal information for 20,000 people obtained from, according to a blog post signed by "Thehacker12" on Aug. 22. is a professional trade show management company that manages conferences, meetings and trade shows for customers, according to the company Website.

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