Military and civilian technological systems, from fighter aircraft to networked household appliances, are becoming ever more dependent upon software systems inherently vulnerable to electronic intruders. To meet its mission of preventing technological surprise and increasing national security, DARPA has advanced a number of technologies to make software more secure.

But what if hardware could be recruited to do a bigger share of that work? That's the question DARPA's new System Security Integrated Through Hardware and Firmware (SSITH) program aims to answer.

"Security for electronic systems has been left up to software until now, but the overall confidence in this approach is summed up in the sardonic description of this standard practice as 'patch and pray,'" said SSITH program manager Linton Salmon of the Agency's Microsystems Technology Office. "This race against ever more clever cyberintruders is never going to end if we keep designing our systems around gullible hardware that can be fooled in countless ways by software.

The SSITH program will complement DARPA software security efforts like High-Assurance Cyber Military Systems (HACMS) and the Cyber Grand Challenge (CGC) by taking advantage of new technologies to develop integrated circuits that are inherently impervious to software end-runs."

Any software patch to a hardware-based security flaw-whether it is in a personal computer or a corporate or government information-technology system-merely salves a symptom without addressing the underlying hardware vulnerability. Left untouched, that same hardware weakness remains vulnerable to follow-on software-based breaches that members of the clever club might devise.

"To break this cycle and thwart both today's and tomorrow's software attacks, the SSITH program challenges researchers to design security directly at the hardware architecture level," said Salmon. "Instead of relying on software Band-Aids to hardware-based security issues, we are aiming to remove those hardware vulnerabilities in ways that will disarm a large proportion of today's software attacks."

SSITH specifically seeks to address the seven classes of hardware vulnerabilities listed in the Common Weakness Enumeration (cwe.mitre.org), a crowd-sourced compendium of security issues that is familiar to the information technology security community. In cyberjargon, these classes are: permissions and privileges, buffer errors, resource management, information leakage, numeric errors, crypto errors, and code injection.

Researchers have documented some 2800 software breaches that have taken advantage of one or more of these hardware vulnerabilities, all seven of which are variously present to in the integrated microcircuitry of electronic systems around the world. Remove those hardware weaknesses, Salmon said, and you would effectively close down more than 40% of the software doors intruders now have available to them.

The strategic challenge for participants in the SSITH program will be to develop new integrated circuit (IC) architectures that lack the current software-accessible points of illicit entry, yet retain the computational functions and high-performance the ICs were designed to deliver.

Another goal of the program is the development of design tools that would become widely available so that hardware-anchored security would eventually become a standard feature of ICs in both Defense Department and commercial electronic systems. The anticipated 39-month program centers on two technical areas.

One of them focuses on the development and demonstration of hardware architectures that protect against one or more of the seven vulnerability classes as well as design tools the electronics community would need for including hardware-based security innovations in their design and manufacturing practices.

The second technical area encompasses methodologies and metrics for measuring (and representing for system designers) the security status of the newly designed electronic systems and any tradeoffs the hardware-won security might levy in the form of system performance, power needs and efficiency, circuit area, and other standard circuit features.

DARPA will host a Proposers Day in support of the SSITH program on Friday, April 21, 2017, at the Booz Allen Hamilton Conference Center (3811 N. Fairfax Drive, Suite 600, Arlington, VA, 22203) from 8:00 am to 5:00 pm EDT. The purpose of this meeting is to provide information on the SSITH program, address questions from potential proposers, and provide an opportunity for potential proposers to identify possible teaming arrangements. Participants must register for the SSITH Proposers Day through the registration website by April 18, 2017, at 5:00 pm EDT. More information about the Proposers Day is available in a Special Notice (DARPA-SN-17-31) posted on FBO.gov. A detailed description of the program, (DARPA Broad Agency Announcement (HR001117S0023), is expected to become available on FBO.gov prior to the Proposers Day.

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