Blockchain-based multi-node authentication method and system

A blockchain-based multi-node authentication system comprising:

• a communication interface;
• a memory in which a computer program is loaded;
• and
• a processor executing the computer program,
• wherein
• the computer program includes:
• instructions for receiving an authentication preparation request from a first user;
• instructions for generating a temporary channel, in which the authentication of a first user terminal of the first user is to be performed, and a channel key for identifying the temporary channel in response to the authentication preparation request, the temporary channel including multiple nodes respectively corresponding to multiple second user terminals, which are to be involved in the authentication of the first user terminal and are randomly selected from user terminals other than the first user terminal;
• instructions for collectively transmitting the channel key to the nodes and distributedly transmitting authentication comparison data, which is to be used in the authentication of the first user terminal, among the nodes;
• instructions for transmitting an authentication preparation completion message, which includes the channel key, to the first user terminal, instructions for receiving an authentication request, which includes the channel key and authentication target data regarding the first user terminal, from the first user terminal;
• instructions for proceeding with the authentication of the first user terminal in response to receiving the authentication request, the authentication of the first user terminal including first and second authentication processes, the first authentication process being an authentication process using a security key transmitted to the first user terminal and some of the nodes that is randomly selected, the security key being generated by randomly extracting and combining authentication elements collected from the first user terminal and the second user terminals, and a second authentication process being an authentication process using the distributedly-transmitted authentication target data and the distributedly-transmitted authentication comparison data;
• instructions for receiving a result of comparison between the distributedly-transmitted authentication comparison data and the distributedly-transmitted authentication target data from the nodes;
• and instructions for determining the success of the authentication of the first user terminal based on the received result of comparison between the authentication comparison data and the authentication target data, and
• the authentication comparison data and the authentication elements collected from the second user terminals are obtained from a distributed ledger.