Imprivata is a Lexington, Mass. company that is working on single sign-on authentication technology, which consolidates all of a corporate user’s accounts to a single password and adds additional security measures to prevent hackers.

The company’s software works together with physical location trackers like keycards, so that an employee’s account will be unusable if, for instance, his location tracker shows him to be in a different place than the computer he’s logging in at.

SAP Ventures provided the $15 million financing, and was joined by previous backers Polaris Venture Partners, General Catalyst Partners and Highland Capital Partners. The company has taken about $50 million to date.

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