Abstract: According to examples, an apparatus may include a top cover, a control panel housing rotatably coupled to the top cover, and a gear assembly. The top cover may include an upper surface and a recess disposed on the upper surface. The control panel housing may include a first section that may house a control panel and a second section that may extend from the first section to mount the control panel housing to the top cover. In some examples, the gear assembly may be disposed in the recess. The gear assembly may include a gear rack fixed to the top cover inside the recess and a gear fixed to the second section of the control panel housing. The gear may be movably coupled to the gear rack to move along the gear rack as the control panel housing is rotated relative to the upper surface of the top cover.

Abstract: According to an example, a display-camera system includes a transparent display panel and a transparent backlight panel. Light sources emit light into the edge of the transparent backlight panel. A first polarizer, between the light sources and the edge of the transparent backlight panel, polarizes the light emitted from the light sources and the transparent backlight panel directs the polarized light towards the transparent display panel. A camera, adjacent a back surface of the transparent backlight panel captures an image of a scene through the transparent display panel and the transparent backlight panel.

Abstract: A public key validation agent (PKVA) includes a registration authority which issues a first unsigned public key validation certificate (unsigned PKVC) off-line to a subject that binds a public key of the subject to a first public key serial number (PKVN). The registration authority maintains a certificate database of unsigned PKVCs in which it stores the first unsigned PKVC. A credentials server issues a disposable public key validation certificate (disposable PKVC) on-line to the subject. The disposable PKVC binds the public key of the subject from the first unsigned PKVC to the first PKVN from the first unsigned PKVC. The credentials server maintains a table that contains entries corresponding to valid unsigned PKVCs stored in the certificate database. The PKVA can be employed in a public key validation service to validate the public key of the subject before a private/public key pair of the subject is used for authentication purposes.