Authorized access to a digital asset is obtained by associating an authentication tag with a physical object accessible to a user, by configuring the tag with a first dataset comprised of a random distribution of three-dimensional elements and with a second dataset comprised of machine-readable data elements, and by authorizing a mobile device to scan the elements. The first and second datasets together comprise an authentication key that uniquely identifies the object and, in turn, the user. The authentication key is scanned by a device in response to a prompt from the digital asset to obtain scanned key data. Predetermined key data and a device identifier indicative of the authorized device are stored in a database. Access to the digital asset is allowed when the scanned key data matches the stored predetermined key data, and when the device scanning the data is authorized.