ELECTRONIC DEVICE WITHIN BLOCKCHAIN BASED PKI DOMAIN, ELECTRONIC DEVICE WITHIN CERTIFICATION AUTHORITY BASED PKI DOMAIN, AND CRYPTOGRAPHIC COMMUNICATION SYSTEM INCLUDING THESE ELECTRONIC DEVICES

摘要

An encryption communication system according to an embodiment of the present invention includes a first electronic device, a second electronic device, and a certification authority. The first electronic device belongs to a first domain that is a blockchain-based public key infrastructure (PKI) domain, and is registered in the distributed ledger of the first domain. The second electronic device belongs to a second domain that is a PKI domain based on a certification authority. The certification authority is a higher level certification authority of the second electronic device, and is registered in the distributed ledger. The certification authority authenticates the first electronic device based on the first certificate of the first electronic device and the first transaction of the first electronic device registered in the distributed ledger according to the request of the second electronic device. The first electronic device authenticates the second electronic device based on the second certificate of the certification authority, the second transaction of the certification authority registered in the distributed ledger, and the third certificate of the second electronic device.