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DALLAS – (NYSE: T) said Thursday it has completed a deal to buy security consulting business.

Financial details were not disclosed.

AT&T said it will combine the business, which helps companies understand and combat online security threats, with its network security operations.

According to AT&T, VeriSign’s Global Security Consulting Services works with Fortune 500 companies to “understand corporate security requirements, navigate diverse regulations, identify security vulnerabilities, defend against and respond to attacks, reduce risk and meet business and industry security compliance requirements.”

"AT&T delivers today’s most powerful weapons to help combat cybersecurity attacks. Our network security solutions rely on three key ingredients – a scalable, reliable global IP network, security experts with in-depth, hands-on experience, and the innovation and research of AT&T Labs," said Ron Spears, president and CEO of AT&T Business Solutions.

"The combined capabilities of VeriSign’s security consulting business with AT&T’s global reach, networking and security portfolio will broaden our consulting and risk analysis expertise, and enable us to more quickly develop and bring to market capabilities to address the evolving security needs of businesses around the world," he added.

VeriSign, based in Mountain View, Calif., runs some of the key directories computers use to route users to Web sites.