System for issuing public certificate on basis of block chain, and method for issuing public certificate on basis of block chain by using same

A method of issuing a public certificate based on basis of a blockchain including a plurality of blockchain nodes comprising:

• a step S100 of a user terminal sending specific personal information for issuing the public certificate to an issuance-requesting server for requesting an issuance of the public certificate on the basis of the blockchain, wherein the specific personal information includes user identification information needed for the issuance;
• a step S110 of the issuance-requesting server confirming the received specific personal information, creating a generation-guiding signal for guiding a creation of a specific private key for the public certificate and a specific public key for the public certificate, and sending the generation-guiding signal to the user terminal which requested the issuance;
• a step S120 of the user terminal, if the generation-guiding signal is received, managing a key-generating engine to generate the specific public key and the specific private key, and sending the specific public key to the issuance-requesting server;
• a step S130 of the issuance-requesting server receiving the specific public key and sending a registration-requesting signal for registering the public certificate for each user, the registration-requesting signal including the specific personal information and the specific public key, to a certificate-managing server for managing the public certificate;
• a step S140 of the certificate-managing server saving the specific personal information and the specific public key included in the received registration-requesting signal in a DB for registration information containing information regarding a registration of public certificates sequentially and cumulatively;
• a step S150 of the certificate-managing server confirming whether one of conditions is met, wherein the conditions include (i) a numeric condition and (ii) a temporal condition, and wherein the numeric condition represents a condition of determining whether the number of pairs, including a specific pair of the specific user's personal information and the specific public key and other pairs of associated users' personal information and associated public keys, reaches a needed number for creation of a root hash value and wherein the temporal condition represents a condition of completing each Merkle tree at predetermined intervals;
• a step S210 of the certificate-managing server, if said one of the conditions is met, operating a first hashing engine of the certificate-managing server to hash each of the pairs sequentially to thereby acquire each node hash information in a specific Merkle tree, and obtaining a specific root hash value for registration, which is used for registering the public certificate, by using said each node hash information;
• a step S220 of the certificate-managing server operating a transaction-processing engine to create (i) specific transaction information for monitoring forgery including the specific root hash value for registration and (ii) a specific transaction ID for monitoring forgery which is used as a key value to search the specific transaction information for monitoring forgery, and sending the specific transaction information for monitoring forgery to the blockchain;
• and
• a step S230 of the blockchain recording the received specific transaction information for monitoring forgery therein, to thereby complete the issuance.