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Alumni Magazine

New authentication system uses unclonable, microscopic features to detect counterfeits with smartphone

Black and white photo of smartphone take a photo of a QR code.

As counterfeit merchandise and documents become more difficult to detect, methods for checking authentication need to become more sophisticated. A new authentication system that gets down to the microscopic level to detect counterfeits is a promising solution — especially since it can all be done using a smartphone.

Chau-Wai Wong, an assistant professor in the Department of Electrical and Computer Engineering, received a patent for this new method, which is cheaper than traditional systems like holograms and ultraviolet ink. It’s also more accurate, as traditional methods rely on human judgment for the final decision.

Common items at risk for counterfeiting include tickets, IDs and merchandise packaging.

The detection method is dependent on the existence of physically unclonable features (PUFs), or the unique, microscopic structures on a surface that are almost impossible to replicate.

Given the advancement and availability of smartphones, Wong saw benefits to making the authentication method available through an app versus traditional technologies.

“With the increased imaging capability of modern smartphones, they make it easier for the technology to be widely used,” Wong said.

On their smartphones, users download the app and take a few photos of their item, and then the app automatically checks them against a verification database. Within this database, previous photographs of the product from different angles are stored by the producer so that users can compare the product in their possession.

The item’s surface is illuminated as the user takes multiple photos. These photos are used to calculate the normal vector field, a verification feature that assesses the unique directions along the surface of a product. These series of directions are then referenced against the photos saved within the verification database and authenticity is verified or denied within seconds.

“Because we have a fingerprint in the database, no matter who’s trying to verify the product and as long as the software is not hacked, we can be confident whether something is or is not authentic,” Wong said.

While the app and verification process are being further improved, the patent now opens the opportunity for commercialization, with the verification process potentially having a promising future in the areas of supply chain management as companies have begun expressing interest.

For his work, Wong was recently awarded the Jimmy H. C. Lin Innovation Award from the University of Maryland (UMD), where he received his Ph.D. The award offers financial assistance to faculty and staff members and students throughout the expensive patenting process in order to support the spirit of invention.

The patent was originally awarded July 28, 2020, with research advice from Min Wu, professor of electrical and computer engineering at UMD. A video of the technology can be viewed at