Achieving Privacy-Preserving Group Recommendation with Local Differential Privacy and Random Transmission

Figure 2

IntPPA algorithm process. User 1 has profile . During the algorithm, user perturbs the profile into and transmits to user 2. Then, user 2 perturbs it into and transmits to user 3. After that, user 3 transmits to user 1, and then user 1 transmits to user 4. Finally, user 4 submits to the server.