One major segment in the market where cryptographic schemes are useful are in consumable authentication products. This includes disposable or limited-use medical probes or sensors. Medical diagnostics manufacturers are quite concerned with patient safety and liability exposure. In order to ensure that an authentic probe or sensor is being used with the medical instrument, a successful authentication sequence must occur between the host and client. In addition to the ever-present liability and safety concerns, there is also a huge revenue preservation element as well.