Data Exchange Algorithm Based on Homomorphic Encryption and Fog Computing

In traditional cloud computing, the computing of encrypted data is usually implemented on the cloud server using the fully homomorphic encryption algorithm, which is too dependent on the trust of the cloud server and the computing burden of users. In order to solve this problem, the fog computing node is introduced between the cloud server and users, and the cipher-text is calculated in the fog computing node based on the fully homomorphic encryption algorithm, Then it is stored in the ECS and sent to the authorized receiver. The authorized receiver uses his private key to decrypt and obtain plaintext to achieve a secure data exchange process. The advantage of this method is that it can ensure that the data is untrusted to both cloud server and fog computing nodes during transmission to the receiver. Even if the malicious user intercepts or cracks the re encrypted cipher-text through illegal means, the private key of the unauthorized receiver cannot decrypt any information in plaintext, which effectively improves the privacy, transparency and efficiency of data exchange. Finally, the security analysis and performance analysis show that the algorithm is feasible and effective.