DATA TRANSMISSION SYSTEM, METHOD, DEVICE, AND PROGRAM, AND DOOR LOCK

摘要

An authentication card (A) and a transceiver (B) on the transmitting side of a data transmission system each have means for converting authentication data to second and first alternate values by using first and second conversion constants and means for transmitting a first transmission signal containing the first alternate value and the first conversion constant and a second transmission signal containing the second alternate value and the second conversion constant to a transceiver (B) on the receiving side. The transceiver (B) on the receiving side has means for extracting the first and second alternate values and the first and second conversion constants from the first and second transmission signals from the transmitting side and means for determines a first set of decoding data from the first alternate value and the second conversion constant and a second set of decoding data from the second alternate value and the first conversion constant.