| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and equipment for communicating information with which a cryptographic key is prevented from being decoded in simple configuration, illegal action based on forgery after authentication is prevented as well and communication is enabled not only between an IC card and an IC card terminal but also between IC cards. SOLUTION: An IC card terminal 1 and an IC card 2 communicate information by performing enciphering processing, the IC card terminal 1 compares a random number synthesized with the information received from the IC card 2 with a random number synthesized with the information transmitted from the IC card terminal 1 to the IC card 2 in advance through a comparison means 14. Only when both the random numbers are equal, the processing of received information is permitted to a data processing means 15 by authenticating the IC card. The IC card 2 similarly processes the received information after the IC card terminal 1 is authenticated as well. |
