Security in IoT Social Networks

8. Basic scheme

In this scheme, m users, and n items are involved in rating to predict the target item. Encryption methods allow tasks to be done on ciphertext and produce encrypted effects. Formally, any encryption method ∈ is valid for routes in R∈ if for any key pair (PK,SK) the output by GenKey∈(γ) for any route R∈R∈ any plaintext p1,p2,…,pn, and ...