The business acquired, Acalis, has headquarters in California. It was purchased from CPU Technology Inc. Financial and other terms of the transaction weren't disclosed.
"Acalis provides security-on-a-chip that can help defend the manned and unmanned aircraft we build at Boeing today and in the future for customers around the world," said Chris Chadwick, president of Boeing Military Aircraft.
"With these processors onboard (the aircraft), warfighters can complete their missions and not be sidelined by malware, cloning and other cyberthreats against the aircraft's systems."
Boeing said Acalis, which has a workforce of 40 people, will be integrated into its Military Aircraft's Global Strike division.
"Acquiring Acalis continues the company's strategy of increasing Boeing's vertical depth to better differentiate its offerings and provide long-term value for its global aerospace and defense customers," Boeing said.