USER DEVICE AND ELECTRONIC DEVICE FOR SHARING DATA BY USING BLOCKCHAIN AND HOMOMORPHIC ENCRYPTION METHOD AND METHODS THEREFOR

摘要

A data sharing method of a user device is provided. The data sharing method includes receiving, from a server device storing information, a private key corresponding to the information, performing a homomorphic encryption of the private key by a homomorphic encryption key provided from the server device, and generating a switch key, and uploading the switch key to a blockchain system. Accordingly, a more effective and clear data sharing is provided.