Voltage Security, a Palo Alto, Calif. company that offers encryption technology to large companies to protect their data, said it has raised $ 12 million fourth round of financing.

Trident Capital led the round with participation from existing investors including Hummer Winblad Venture Partners, Morgenthaler Ventures, Menlo Ventures, Cipio Partners and JAFCO Ventures. Peter T. Meekin, Managing Director at Trident Capital, joins the Voltage Board of Directors.

The company recently said it saw record financial performance for the first half of 2007, including nearly 80 percent growth in revenues for the trailing four quarter period, and positive cash flow from operations for the past two consecutive quarters.

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