Abstract: A blockchain-based multi-node authentication method capable of improving the security and convenience of user (or user terminal) authentication is provided.

Abstract: The present invention relates to a security authentication system for generating a secure key by combining authentication elements of multi-users and a security authentication method thereof, and more particularly, to a security authentication system for generating a secure key by combining authentication elements of multi-users and a security authentication method so as to collect information from multi-users in a smart terminal-based security authentication environment and generate a secure key by combining the collected information of multi-users as authentication elements.