USER DEVICE AND ELECTRONIC DEVICE FOR SHARING DATA BASED ON BLOCK CHAIN AND HOMOMORPHIC ENCRYPTION TECHNOLOGY AND METHODS THEREOF

摘要

Disclosed is a data sharing method of a user device. According to the present invention, the method comprises the following steps: receiving a private key from a server device storing information; generating a conversion key by performing homomorphic encryption on the private key using a homomorphic encryption key provided by the server device; and uploading the conversion key on a blockchain system. Accordingly, data can be shared effectively and transparently.