Abstract: Stacked integrated circuit devices, chip packages and methods for operating a chip package are described herein that provide an increased level of backside protection from physical attacks that could compromise confidentiality or authentication of the integrated circuit device. In one example, a chip stack includes a sacrificial integrated circuit (IC) die stacked with a primary IC die. The sacrificial IC die includes a first split key information source. The primary IC die has security circuitry configured to generate an encryption key based at least in part on first split key information transmitted from the sacrificial IC die across a die-to-die interface to the primary IC die. Separation of the dies to probe or modify of the primary IC die would cause the destruction of split key information required to operate the functional circuitry of the primary IC die.

Abstract: A remote transit authority fare collection system includes at least one server configured to receive fare collection information and at least one database configured to store the fare collection information received by the at least one server. The at least one server is further configured to aggregate the fare collection information, and the at least one server is further configured to analyze the fare collection information, wherein the fare collection information received by the at least one server is received over a network from a remote unit. The invention further includes a remote transit authority fare collection process.

Abstract: Disclosed is a portable safety trainer that can be totally controlled by an instructor and provides safety training in operating an ATV, a dirt bike or a snowmobile. The trainer uses an actual ATV, dirt bike or snowmobile as part of a course in basic safety. In one embodiment, the trainer is used in conjunction with a movie player and a screen to show students real-life examples of driving an ATV, dirt bike or snowmobile without endangering the safety of the students being trained.