TABLE 1
Summary Table of the Information That Can Be Potentially Leaked From User m to Either an Eavesdropping Agent or the n-th User
| Scheme | Eavesdropper privacy | n-th user privacy | RT | ||
|---|---|---|---|---|---|
 |  |  |  | ||
| non-encryption | ✔ | ✘ | ✔ | ✘ | ✔ |
| regular encryption | ✔ | ✔ | ✔ | ✘ | ✔ |
| homomorphic encryption | ✔ | ✔ | ✔ | ✔ | ✘ |
Note: The primary information indicates either the user’s position
or the associated position uncertainty . A check denotes that the quantity is kept private, while a cross refers otherwise. The table also shows the real-time (RT) readiness of each approach, given the corresponding complexity.
