| 20080258864 | Communication Apparatus and Communication Method - A communication apparatus for mutual communication, when acting as an authenticator communication apparatus performing authentication, includes a transmitting section that transmits to an authenticatee communication apparatus subject to authentication challenge data to authenticate the authenticatee communication apparatus in a time slot, which is a segmented period of time in which the communication apparatus to communicate with a specific communication apparatus; and a receiving section that receives from the authenticatee communication apparatus first response data for responding to the challenge data in the same time slot as the one in which the transmitting section transmits the challenge data. An objective is to carry out authentication of a tag by a Reader/Writer (R/W) and authentication of the R/W by the tag at the same time as an anti-collision process, and to further achieve confidentiality of unique ID information that is transmitted. | 10-23-2008 |
