Apparatus and method for group key generation using wireless channel status

PURPOSE: A device generating a group key using a state of wireless channel and a method thereof are provided to efficiently generate a group key in an ad-hoc network since the method is not a centralized type secret key distribution method. CONSTITUTION: A representative channel response selection unit(14) selects a representative channel response signal in the pilot signals received from the slave terminals in a wireless network group. A key generation unit(15) generates a group key based on a representative channel response value of the representative channel response signal selected by the representative channel response selection unit. A hash value generation unit(16) generates a hash value corresponding to the group key by applying the group key to a hash algorithm. A transmission pilot control unit(17) controls power intensity with respect to a transmission pilot of respective slave terminals using a channel response value of the representative channel response signal, and the channel response value and the transmission power intensity of each slave terminal. A communication unit(12) is connected to the respective slave terminals and transmits the pilot signal of which power intensity is controlled by the transmission pilot control unit and hash value to the slave terminal. [Reference numerals] (11) Control unit; (12) Communication unit; (13) Storage unit; (14) Representative channel response selection unit; (15) Key generation unit; (16) Hash value generation unit; (17) Transmission pilot control unit; (18) Pilot signal generation unit