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As data collection and analysis become critical functions for many cloudapplications, proper data sharing with approved parties is required. However,the traditional data sharing scheme through centralized data escrow servers maysacrifice owners' privacy and is weak in security. Mainly, the serversphysically own all data while the original data owners have only virtualownership and lose actual access control. Therefore, we propose a 3-layerSSE-ABE-AES (3LSAA) cryptography-based privacy-protected data-sharing protocolbased on the assumption that servers are honest-but-curious. The 3LSAA protocolrealizes automatic access control management and convenient file search even ifthe server is not trustable. Besides achieving data self-sovereignty, ourapproach also improves system usability, eliminates the defects in thetraditional SSE and ABE approaches, and provides a local AES key recoverymethod for user's availability.

3LSAA: A Secure And Privacy-preserving Zero-knowledge-based Data-sharing Approach Under An Untrusted Environment