METHOD FOR GENERATING SECRET KEY AND ELECTRONIC DEVICE USING THE SAME

摘要

PURPOSE: A secret key generation method and an electronic device applying the same are provided to generate a secret key without using hardware for generating random number by generating a final secret key from a first secret key obtained from measured parameter value measured from an internal device. CONSTITUTION: A voltage sensor of a BMS generates a digital voltage value(S471). A control unit of the BMS stores a first secret key in a memory(S472). A control unit PKI encodes the first secret key(S473). A control unit transmits the encoded first secret key to a monitoring PC(S474). A central control unit of the monitoring PC decodes the first secret key(S475). The central control unit generates a second secret key(S476). The central control unit stores a third secret key in a storage unit(S477). The central control unit encodes the second secret key using the first secret key(S478). The central control unit transmits encoded secret key to the BMS(S479). A control unit of the BMS decodes the encoded second secret key(S480). A control unit stores a generated third secret key in the memory(S481). [Reference numerals] (100) Monitoring PC; (S471) Measuring the voltage of batteries, converting analog to digital and generating a digital voltage value; (S472) Generating and storing a first secret key(K_BMS_1) using the digital voltage value; (S473) Coding the first secret key(K_BMS_1) by a public key; (S474) Transmitting to the monitoring PC; (S475) Decoding the first secret key(K_BMS_1) coded by a private key; (S476) Generating a second secret key(K_MON_PC_2); (S477,S481) Generating and storing a third secret key(K_COM_3) by XOR operation of the first secret key(K_BMS_1) and the second secret key(K_MON_PC_2); (S478) Coding the second secret key(K_MON_PC_2) by the first secret key(K_BMS_1); (S479) Transmitting to a BMS; (S480) Decoding the second secret key(K_MON_PC_2) coded by the first secret key(K_BMS_1)