关键词: 云存储, 数据去重, 动态所有权管理, 访问控制, 延迟更新

Abstract:

Deduplication technology has been widely used in cloud storage to reduce storage space and communication cost by storing only a copy of redundant data. To achieve secure data deduplication, convergent encryption and many variants of it have been proposed. However, many schemes do not consider the problem of ownership changes and Proof-of-Ownership（PoW）. This paper puts forward a safe and efficient dynamic ownership management scheme, preventing users who revoke ownership from properly decrypt ciphertext by updating the group secret key and reencrypt the secret key ciphertext. The scheme supports secure PoW based on Bloom Filter and puts forward a new delay update strategy to further reduce the computational cost. Analysis and comparison show that the scheme has lower cost and is effective in dynamic ownership management.

Key words: cloud storage, data deduplication, dynamic ownership management, access control, delay update