LAUSR

How to make cloud computing ensure the privacy of data while ensuring its availability in the process of computing data is a big problem faced by cloud computing. Under the background of quantum information processing, a quantum fully homomorphic encryption (QFHE) scheme is proposed. QFHE based on universal quantum circuit (UQC) allows arbitrary quantum transformation. QFHE allows the operation of encrypted data without decryption, which greatly ensures the security of data. In this scheme, the encryption key is constructed by GHZ-like state. Both the encryption key and the decryption key use quantum one-time pad (QOTP), and the decryption key is different from the encryption key. In this scheme, the evaluation algorithm is independent of the encryption key, which is a powerful tool to protect data privacy in the cloud environment. In addition, security analysis and complexity analysis also show that the scheme is suitable for privacy data processing.