Aspects described herein may provide detection of a physical characteristic of a credential, thereby allowing for authentication of the credential. According to some aspects, these and other benefits may be achieved by detecting the physical characteristic with the credential. An image of a credential may be received. An optical characteristic of a secure feature of the credential may be determined. An expected optical characteristic of the secure feature may be determined based on known properties of the secure feature. A determination as to whether the credential is authentic may be based on a comparison of the determined optical characteristic of the secure feature to the expected optical characteristic of the secure feature.

Aspects described herein may provide detection of a physical characteristic of a credential, thereby allowing for authentication of the credential. According to some aspects, these and other benefits may be achieved by detecting the physical characteristic with the credential. An image of a credential may be received. An optical characteristic of a secure feature of the credential may be determined. An expected optical characteristic of the secure feature may be determined based on known properties of the secure feature. A determination as to whether the credential is authentic may be based on a comparison of the determined optical characteristic of the secure feature to the expected optical characteristic of the secure feature.

A visual security feature is provided that is disposed on a target. The visual security feature includes two substantially transparent layers. At least one of the two substantially transparent layers is present in an image-wise pattern.

A wearable device includes a wireless receiver, a processor, a memory component, and a graphical display. The wireless receiver is configured to be in wireless signal communication with a remote user device so that the wireless receiver can receive a programming signal from the remote user device. The memory component stores non-transitory computer-executable instructions that, when executed by the processor, cause the wearable device to display one or more graphics at the graphical display. Upon receiving the programming signal from the remote user device, the processor can execute the non-transitory computer-executable instructions to cause the processor to generate an interface input signal based on the received programming signal and convey the interface input signal to the graphical display to cause the graphical display to display one or more graphics corresponding to the interface input, and thus corresponding to the programming signal.

A wearable device includes a wireless receiver, a processor, a memory component, and a graphical display. The wireless receiver is configured to be in wireless signal communication with a remote user device so that the wireless receiver can receive a programming signal from the remote user device. The memory component stores non-transitory computer-executable instructions that, when executed by the processor, cause the wearable device to display one or more graphics at the graphical display. Upon receiving the programming signal from the remote user device, the processor can execute the non-transitory computer-executable instructions to cause the processor to generate an interface input signal based on the received programming signal and convey the interface input signal to the graphical display to cause the graphical display to display one or more graphics corresponding to the interface input, and thus corresponding to the programming signal.

The identification document comprises a personalized area carrying owner-specific information, such as an owner's name data or photograph, The personalized area is overlapped by a lightguide, The lightguide comprises a primary incoupler and a primary outcoupler on opposite sides of the personalized area. Any attempt to tamper with the personalized area may lead to a damage in the lightguide, which can easily be detected by coupling light into the primary incoupler and testing the light coupled out by the primary outcoupler.

The identification document comprises a personalized area carrying owner-specific information, such as an owner's name data or photograph, The personalized area is overlapped by a lightguide, The lightguide comprises a primary incoupler and a primary outcoupler on opposite sides of the personalized area. Any attempt to tamper with the personalized area may lead to a damage in the lightguide, which can easily be detected by coupling light into the primary incoupler and testing the light coupled out by the primary outcoupler.

The security document, such as a passport, comprises a lightguide having an incoupler structure and in outcoupler structure. The outcoupler structure is sparse in the sense that any part of the protective area is close to a part of the outcoupler structure. However, to secure a large protective area with a limited amount of incoupled light, outcoupler structure covers no more than 20% of the protective area. This allows to protect a large area of the security document, such as a photograph or other personalized information, by means of the lightguide.

The security document, such as a passport, comprises a lightguide having an incoupler structure and in outcoupler structure. The outcoupler structure is sparse in the sense that any part of the protective area is close to a part of the outcoupler structure. However, to secure a large protective area with a limited amount of incoupled light, outcoupler structure covers no more than 20% of the protective area. This allows to protect a large area of the security document, such as a photograph or other personalized information, by means of the lightguide.

In general, the subject matter described in this specification relates to security credentials for documents, such as identification documents. One example is an identification document that includes a photographic image of an individual associated with the document, and a spiral pattern applied to a region of the identification document. The spiral pattern includes an elliptical spiral segmented into a plurality of arc segments, where wherein the arc segments of the spiral pattern encode identification data associated with the individual. Other implementations include corresponding processes, systems, apparatus, and computer programs related to generating and verifying identification documents with spiral patterns.