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    • 1. 发明公开
    • SECURING CREDENTIALS WITH OPTICAL SECURITY FEATURES FORMED BY QUASI-RANDOM OPTICAL CHARACTERISTICS OF CREDENTIAL SUBSTRATES
    • EP3378670A1
    • 2018-09-26
    • EP18163083.1
    • 2018-03-21
    • Assa Abloy AB
    • Rowe, Robert K.
    • B42D25/318B42D25/43B42D25/305B42D25/351B42D25/435B42D25/445
    • Systems and methods are described for securing credentials with optical security features formed by quasi-random optical characteristics (QROCs) of credential substrates. A QROC can be a pattern of substrate element locations (SELs) on the substrate that includes some SELs that differ in optical response from surrounding SELs. During manufacturing, a QROC of a substrate can be characterized, hidden by a masking layer, and associated with a substrate identifier. During personalization, personalization data can be converted into an authentication graphic formed on the substrate by de-masking portions of the masking layer according to a de-masking pattern. The graphic formation can result in a representation that manifests a predetermined optical response only when the de-masking pattern is computed with knowledge of the hidden QROC. The authentication graphic and optical response can facilitate simple human authentication of the credential without complex or expensive detection equipment. Unique properties of the substrate (e.g., inherent variations in color, microstructure), which are uncontrollable and not possible to copy or reproduce, are detected or scanned, in order to furnish a unique signature of the substrate (the QROC). Identification data and this signature are used to personalise the security document (credential) by selectively removing material from a mask layer covering the substrate; lasers, chemicals, etc. can be used to ablate, etch, and/or otherwise affect the obscuring properties of the mask.