1. Authors: Chun-Ta Li and Min-Shiang Hwang Reporter: Chun-Ta Li (李俊達)
A secure routing protocol with payment mechanism to prevent node selfishness in mobile ad hoc networks
Authors: Chun-Ta Li and Min-Shiang Hwang
Reporter: Chun-Ta Li (李俊達)

2. Outline Motivation Preliminaries The proposed scheme
Performance evaluation 2 2

3. Motivation Ad hoc communications Resource-constrained devices
Selfishness
Motivation S I1 I2 … Im D
Ad hoc communications
Communication nodes must act as routers (routing) for themselves
Rely on other nodes to relay communication data
Resource-constrained devices
The behavior of node selfishness
Refuse to forward packets to others (stop forwarding attack)
Discard route-discovery requests from others
intermediate nodes

4. Motivation (cont.) Payment system  Nuglets (virtual currency)
Source node pays for the transmission request
Intermediate nodes all gained from the request
Advantage:
Prevent networks from packet flooding attacks
Promote a selfless environment and enforce node cooperation in MANETs
Requirements
Non-repudiation, impersonation/tampering attacks
Generate a dynamic session key
Detection of malicious intermediate nodes

6. Preliminaries Identity-based encryption (IBE) scheme
Setup (KGC, Key Generator Center)
Extract
Publish the public parameters

7. Preliminaries (cont.) Identity-based encryption (IBE) scheme
Encrypt (message M)
Decrypt

8. The proposed scheme

9. The proposed scheme

10. The proposed scheme

12. The proposed scheme
Data transfer phase with payment mechanism

13. Performance evaluation

14. THa:
TSym:
TSig:
TVer:
TEn:
TDe:
TEC: