Abstract: Disclosed is a server for processing real estate investment mediation based on security token and an operation method therefor. In the server for processing real estate investment mediation and the operation method therefor according to the present invention, when information on a desired purchase quantity is received from a user terminal of any one real estate investor in addition to a purchase request signal for a specific security token issued by any one real estate investment execution company, authentication for the use terminal is completed, and then purchase processing for the specific security token is performed in response the purchase request signal to support a real estate investor to easily purchase a security token issued by the real estate investment execution company through online.

Abstract: The present invention relates to a method and system for encrypted communication between devices belonging to a group having been authenticated on the basis of stability provided by a block chain system. According to the present invention, P2P encrypted communication, encrypted communication between 1 and N, or encrypted communication N and N is possible on a block chain system, in which all contents are disclosed, whereas an existing block chain enables only fully disclosed information to be shared.