Abstract: A system and method for transferring data between a transmitter and a receiver over a single conductor is disclosed. During a data transfer operation of bit of information, the voltage level on the conductor is changed from a first voltage level to a second voltage level and maintained at the second voltage level for a predetermined duration of time. The predetermined duration of time is determined by the logical state of the data bit being transmitted. Upon expiration of the predetermined duration of time the voltage level on the conductor is driven back to substantially the first voltage level.

Abstract: An authentication process for authenticating a battery to a cellular telephone includes the step of receiving a challenge from the cellular telephone at the battery over a single wire conductor. In response to the challenge, the seed values are retrieved from the memory and a response is generated based upon the challenge and the seed values. The response is transmitted back to the cellular telephone from the battery over the single conductor so that a comparison with a similar response generated by the cellular telephone may be made.

Abstract: An authentication process is performed by receiving a challenge and retrieving stored seed values. A response is generated based on the challenge and the seed values.