Cloud server quantum data secret sharing scheme

Storing data in the form of quantum states on cloud servers can significantly enhance storage efficiency. The storage and sharing of quantum data on cloud servers necessitate consideration of security issues. An ingenious solution is to store data in the form of ciphertext on cloud servers. When data needs to be shared with users, the cloud server performs a second encryption on the data ciphertext and sends the doubly encrypted ciphertext to the users. Users can decrypt and obtain the data itself using their private keys. This process can be regarded as the transformation of the data owner’s ciphertext into a shared ciphertext by a third party (the cloud server). This study proposes a new quantum data sharing scheme for cloud servers. One of our main contributions is the realization of sharing specific data with users who have appropriate permissions (satisfying certain attribute-based conditions). The security of the scheme is demonstrated through key analysis, plaintext analysis, first-level ciphertext analysis, and second-level ciphertext analysis.