Terminal registration system and terminal registration method with reduced number of communication operations

Abstract

[Problem] A terminal registration system and a terminal registration method that enable the number of communication operations between terminals to be reduced are provided. [Solution] The terminal registration systemincludes an existing terminal Aincluding, in a secure area including a TEE, a certificate issuing unitconfigured to issue an owner certificate indicating the owner of the terminal, an existing terminal-side coordination unitconfigured to coordinate terminals having an owner certificate identical to the issued owner certificate and generate a cryptographic key, an authentication key management unitconfigured to manage an authentication private key, and including, in a terminal environment including an REE, an inter-terminal coordination appconfigured to perform inter-terminal communication, a new terminal Bmakes a request for starting encrypted communication using a cryptographic key to the existing terminal Afrom an inter-terminal coordination appon the new terminal Bside, and the existing terminal-side coordination unitof the existing terminal Asends coordination data with the authentication private key encrypted with the cryptographic key to the new terminal Bhaving the identical owner certificate.