Abstract
Authentication of physical items is an age-old problem. Common approaches include the use of bar codes, QR codes, holograms, and RFID (radio-frequency identification) tags. Traditional RFID tags and bar codes use a public identifier as a means of authenticating. A public identifier, however, is static: it is the same each time when queried and can be easily copied by an adversary. Holograms can also be viewed as public identifiers: a knowledgeable verifier knows all the attributes to inspect visually. It is difficult to make hologram-based authentication pervasive; a casual verifier does not know all the attributes to look for. Further, to achieve pervasive authentication, it is useful for the authentication modality to be easy to integrate with modern electronic devices (e.g., mobile smartphones) and to be easy for non-experts to use.
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