Hackers have obtained a digital certificate good for any Google website from a Dutch certificate provider, a security researcher said today.

Criminals could use the certificate to conduct "man-in-the-middle" attacks targeting users of Gmail, Google's search engine or any other service operated by the Mountain View, Calif. company.

"This is a wildcard for any of the Google domains," said Roel Schouwenberg, senior malware researcher with Kaspersky Lab, in an email interview Monday.

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