Abstract: Techniques are disclosed relating to biometric authentication, e.g., facial recognition. In some embodiments, a device is configured to verify that image data from a camera unit exhibits a pseudo-random sequence of image capture modes and/or a probing pattern of illumination points (e.g., from lasers in a depth capture mode) before authenticating a user based on recognizing a face in the image data. In some embodiments, a secure circuit may control verification of the sequence and/or the probing pattern. In some embodiments, the secure circuit may verify frame numbers, signatures, and/or nonce values for captured image information. In some embodiments, a device may implement one or more lockout procedures in response to biometric authentication failures. The disclosed techniques may reduce or eliminate the effectiveness of spoofing and/or replay attacks, in some embodiments.

Abstract: Methods, computer program products, and systems are presented. The methods include, for instance: obtaining an unmarked questionnaire form and creating form metrics data of the unmarked questionnaire form, receiving a selection marked form having freehand marks and determining selections data by quantifying a center point of a freehand mark and by comparing the center point with the form metrics data. Selections data may be adjusted according to positional consistency amongst the freehand marks if one mark is ambiguous as to the distances to answer choices.

Abstract: Methods, computer program products, and systems are presented. The methods include, for instance: obtaining an unmarked questionnaire form and creating form metrics data of the unmarked questionnaire form, receiving a selection marked form having freehand marks and determining selections data by quantifying a center point of a freehand mark and by comparing the center point with the form metrics data. Selections data may be adjusted according to positional consistency amongst the freehand marks if one mark is ambiguous as to the distances to answer choices.