Abstract: A computer includes a processor and a memory, the memory stores instructions executable by the processor to project a first specified time-varying illumination pattern to an area outside of an object undergoing authentication, to capture images of the object and a portion of the area outside of the object, and to authenticate a scene that includes the images based on a comparison between the first specified time-varying illumination pattern with a second time-varying illumination pattern extracted from the images.

Abstract: A computer includes a processor and a memory, the memory stores instructions executable by the processor to project a first specified time-varying illumination pattern to an area outside of an object undergoing authentication, to capture images of the object and a portion of the area outside of the object, and to authenticate a scene that includes the images based on a comparison between the first specified time-varying illumination pattern with a second time-varying illumination pattern extracted from the images.

Abstract: Upon authorizing a user via challenge biometric data, user data is determined to be updated based on detecting a trigger. Upon detecting the trigger prior to authenticating the user, the user data is updated with the challenge biometric data based on authenticating the user. Upon detecting the trigger after authenticating the user, the user data is updated with updated challenge biometric data based on a confidence score for the second biometric data exceeding a threshold. Structure components are controlled based on the updated user data.

Abstract: Upon authorizing a user via challenge biometric data, user data is determined to be updated based on detecting a trigger. Upon detecting the trigger prior to authenticating the user, the user data is updated with the challenge biometric data based on authenticating the user. Upon detecting the trigger after authenticating the user, the user data is updated with updated challenge biometric data based on a confidence score for the second biometric data exceeding a threshold. Structure components are controlled based on the updated user data.

Abstract: In response to a trigger event, a challenge message that includes a security code by inputting the security code to a cryptographic program that encrypts the security code based on an authentication key is generated by a first computer. Upon transmitting the challenge message to a second computer, the security code is updated by the first computer based on a random number output from a random number generator. A response is received by the first computer from the second computer in response to the challenge message. Upon verifying the second computer based on the response, a security message including the updated security code is transmitted from the first computer to the second computer.