Secure Encryption Scheme for Medical Data based on Homomorphic Encryption

With the development of cloud computing, cloud healthcare has brought convenience to users and improved the utilization of healthcare resources, but it also brings some security risks. To this end, this paper proposes a new solution that combines homomorphic encryption technology and domestic cryptographic algorithms for protecting the privacy of cloud medical electronic medical records. It is found that by localizing user keys, data leakage due to malicious damage can be effectively prevented. In addition, this study proposes a hybrid encryption scheme and a ciphertext digest-based search and statistics approach to reduce the computational overhead required to decrypt all electronic medical records. The scheme is the first to use a combination of domestic cryptographic algorithms and homomorphic encryption techniques in a cloud medical data storage and computing application scenario to achieve secure and reliable cloud medical data storage and computing. In addition, the study provides several recommendations for healthcare organizations and cloud platform service providers to help them better protect the security and privacy of healthcare data.