COMMUNICATION DEVICE, AND COMMUNICATION METHOD

摘要

A mutual communication device comprises, in case it is an authentication side communication device, a transmission unit for transmitting such challenge data to an authenticated side communication device or a communication device to be authenticated, as to authenticate the authenticated side communication device, at a time slot or a time band for communications with a specific communication device, and a reception unit for receiving first response data to respond to the challenge data, from the authenticated side communication device at the same time slot as that, at which the transmission unit transmitted the challenge data to the authenticated side communication device. Simultaneously with an anti-collision processing, the communication device executes the authentication of a tag by a R/W (Reader/Writer) and the authentication of the R/W by a tag, and realizes the concealment of the intrinsic ID information to be transmitted.