Research on Lightweight Key Management Solution in Hybrid Cloud

From a security perspective, the cloud is not a trusted third party, and there are hidden dangers such as malicious theft or leakage of keys by cloud storage service providers. The artice use synthesizing encryption keys, the security of encryption keys is ensured. Based on the Lagrangian interpolation method, the encryption key is efficiently synthesized using the subkey saved in the cloud and the subkey saved in the client. The effectiveness and practicality of the method were verified through numerical examples.