Importance

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Abstract

An access-control-purpose system that provides access information to first and second communication devices that perform mutual authentication using ID-based encryption creates an access secret key by generating a hash value of a logical sum of a character string based on the access information and a master secret key, creates first authentication data by generating a hash value of a first authentication ID for the first communication device by using a first hash function, creates second authentication data by generating a hash value of a second authentication ID for the second communication device by using a second hash function, creates access confirmation data configured by a product of the access secret key and a generation source of a subgroup in a group on a first elliptic curve and a product of the access secret key and a generation source of a subgroup in a group on a second elliptic curve, transmits the first authentication data and the access confirmation data to the first communication device, and transmits the second authentication data and the access confirmation data to the second communication device.

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First Claim