| 摘要 |
PROBLEM TO BE SOLVED: To improve the efficiency of other party authentication and key deliv ery by preparing a response by mutually using an irreversible compression function (a hash function) or a common key cryptography based on random numbers of the other party and by mutually exchanging its response. SOLUTION: Equipment A101 calculates a response rA based on rA=h (KB||nA||nB) by using random numbers kB, nA and nB. An arithmetic operation X||Y denotes that bit sequences X and Y are connected and a function h(X) denotes a hash function. Next, the equipment A101 transmits the response rA to equipment B102. Similarly, the equipment B102 transmits a response rB to the equipment A101. Next, the equipment A101 calculates h(kA||nB) by using random numbers kA, nA and nB and verifies that the result is equal to the response rB received from the equipment B102. Then, the equipment A101 verifies a certifier certB of the equipment B102 by using a public key PLA of a key management organization 131. When the verification result is correct, the equipment A101 cortifies that the equipment B102 is the right equipment. |
