Merged company plans to use AI to test the security of U.S. national infrastructure. Their offensive operations remain under wraps.

Boldend, a secretive cybersecurity and hacking contractor for U.S. military and intelligence agencies that is backed by billionaire investor Peter Thiel, is being acquired by Sixgen, which also provides cyber tools to the U.S. government.

The news comes a year after Sixgen was itself acquired by private equity company Washington Harbour, which is planning to build a significant business in the “full-spectrum” cyber industry, where companies provide both offensive and defensive services. Boldend and Sixgen declined to provide financials for the acquisition.