SELF-AUTHENTICATION COMMUNICATION DEVICE, SELF-AUTHENTICATION VERIFICATION COMMUNICATION DEVICE, DEVICE AUTHENTICATION SYSTEM, DEVICE AUTHENTICATION METHOD FOR DEVICE AUTHENTICATION SYSTEM, SELF-AUTHENTICATION COMMUNICATION PROGRAM, AND SELF-AUTHENTICATION VERIFICATION COMMUNICATION PROGRAM

摘要

A system in which a communication device performs safe communication by using a digital certificate allows a device of the other party of the communication to verify that a self-certificate has surely been generated by the device indicated on the self-certificate even if the offline pre-distribution of the self-certificate is not performed. The communication device (200) generates an ID-based cryptographic secret key (293b) with device-unique ID (291b) as a public key on the basis of a master key and a public parameter (293a). The communication device (200) then generates the electronic signature of an RSA public key (292b) as an ID-based cryptographic signature (294b) by using the ID-based cryptographic secret key (293b). The communication device (200) further generates an RSA self-signature (294a) for the RSA public key (292b), an expiration date, a host name (291c), the device-unique ID (291b), and the ID-based cryptographic signature (294b). The communication device (200) furthermore generates a self-signature certificate (294) including the ID-based cryptographic signature (294b) and the RSA self-signature (294a).