BASE STATION

摘要

A storage unit (44) stores a table of shared keys representing a plurality of types of shared keys that can be used for communication between terminals. A MAC frame processor (26) receives packet signals transmitted from terminals. A confirmation unit (44) confirms the version of the shared key table, which contains shared keys for generating electronic signatures attached to the received packet signals. A detection unit (46) detects that the version of the confirmed shared key table is older than the version of the shared key table stored by the storage unit (44). If the number of detections is equal to or greater than a prescribed count in a unit period, the MAC frame processor (26) generates packet signals that contain the shared key table stored in the storage unit (44). The MAC frame processor (26) transmits the generated packet signals.