Abstract: Example embodiments of systems and methods for data transmission system between transmitting and receiving devices are provided. In an embodiment, each of the transmitting and receiving devices can contain a master key. The transmitting device can generate a diversified key using the master key, protect a counter value and encrypt data prior to transmitting to the receiving device, which can generate the diversified key based on the master key and can decrypt the data and validate the protected counter value using the diversified key.

Abstract: Packaging configured to contain an item is made from a pre-formed plastic web from which a user-graspable tear tab extends to enable removal of the item from the packaging. Preferred embodiments each include a plastic web in the form of a pocket and positioned between front and back lidding sheets that have adhesive sections bonded together to form unitary packaging. The pocket is sized to pass through a pocket-receiving aperture in the front lidding sheet and retains and displays the packaged item. The tear tab outwardly extends from a peripheral flange from which the plastic web depends. A score line boundary formed in one of the front and back lidding sheets circumscribes or partly circumscribes at least a majority of the pocket receiving aperture and allows removal of the item by a user pulling the tear tab to tear open the packaging along the score line boundary.