Lockheed Martin [LMT] and its partner Guardtime Federal have signed a long-term contract to bring the cyber security company’s blockchain technology to Lockheed Martin Aeronautics supply chain to mitigate cyber threats.

Lockheed Martin said on Thursday it will used Guardtime Federal’s KSI blockchain signatures to provide digital integrity from the external software supply chain to verification on delivered military aircraft.

“Lockheed Martin is committed to continuous Agile development of secure software,” Ron Bessire, vice president of Lockheed Martin Aeronautics, said in a statement. “This collaboration with Guardtime Federal assures the highest level of digital security and enhances the integrity of our aircraft, further enabling pilots to achieve mission success in hostile cyber environments.”

Guardtime Federal’s KSI technology will also be integrated into digital-based manufacturing equipment to detect unauthorized residuals from third party routine maintenance actions, further strengthening the software supply chain, Lockheed Martin said.

“Our collaboration with Lockheed Martin is delivering a mathematically provable process for data integrity to the customer to assure that the software envisioned, developed, tested and certified is what makes it onto the platform every time,” David Hamilton, president of Guardtime Federal, said in a statement.

Guardtime Federal is based in Northern Virginia and licenses technology from its parent, Switzerland-based Guardtime Holdings