A Survey of Trust Evaluation Methods (Supervisor : Yan Wang )

1. A Survey of Trust Evaluation Methods(Supervisor: Yan Wang) Name :Erden Sacan Student ID :40916332 Unit :ITEC810

2. Agenda • Definition of Trust and an example • Four major areas in application of trust evaluation methods • Findings of research & conclusion A Survey of Trust Evaluation Methods

3. What is Trust? • “A relationship of reliance dependent on what other people say.” • “An agent’s estimate of how likely another is to fulfil its commitments “ A Survey of Trust Evaluation Methods

4. Trust Evaluation Methods Survey • Various ways to measure trust in computer applications. • How to choose? • Which one is the best? • Is there a “best” • Collect and classify trust evaluation methods • Analyse and find; • Strenghts • Weaknessess • Similarities • General requirements of different applications A Survey of Trust Evaluation Methods

5. An Example! A Survey of Trust Evaluation Methods

6. User Feedback Ratings A Survey of Trust Evaluation Methods

7. eBay summary • Buyers and sellers in can rate each other • Negative, neutral or positive ratings • User Rating= positive feedback count – negative feedback • Feedback ratingssummary is displayed on user’s profile • Too simple - But it works! (Ref:www.ebay.com) A Survey of Trust Evaluation Methods

8. Major applications • E-commerce • Peer-to-peer networks • Gnutella, BitTorrent • Service-oriented computing • Distributed software development • Multi-supplier supply chains for web services A Survey of Trust Evaluation Methods

9. E-commerce • Needs centralised management • Binary rankings are not enough • Negative ratings are very uncommon • Needs additional parameters of trust: • Customer satisfaction level • Number of transactions by a party • The amounts of transactions • Timely delivery of goods A Survey of Trust Evaluation Methods

10. P2P Networks • P2P Information sharing networks • Open to public • Big scale • No central authority • Mostly requesting party doesn’t know target (serving) party A Survey of Trust Evaluation Methods

11. P2P Networks – Trust Systems • Binary rankings generally work • File transfer – (successful or unsuccessful) • Self-policing (Not centralised) • Anonymity (Hide user IDs) • No profit for newcomers • Minimal overhead • Parties are not always online A Survey of Trust Evaluation Methods

12. Service Oriented Computing (SOC) • Service Oriented Computing: • Many providers offering services over the network • Distributed software development • Fast, cheap, highly reusable services(coding and orchestration of code) • Also adopted by other sectors • Travel agencies(car rental, hotel, airline, insurance services) A Survey of Trust Evaluation Methods

13. Service Oriented Computing (SOC) – How to use trust? A Survey of Trust Evaluation Methods

14. Service Oriented Computing (SOC) – Trust Methods • SOC Trust Evaluation Methods: • Many domains – many rules – trust system needs to be flexible (event driven) • System should consider; • Quality of Service • Timeliness • Use multiple feedback sources (memberhips, certificates) • Needs good filtering of malicious and fake entries A Survey of Trust Evaluation Methods

15. Conclusion • “All-in-one-best trust mechanism” – Not possible! (At least for now) • Every area has different requirements • Some needs a simple approach • Some needs many parameters • All of them need to prevent malicious entries A Survey of Trust Evaluation Methods

16. Thank You... • Today we have talked about; • What trust is • Trust evaluation methods in different applications • Trust evaluation requirements of applications. A Survey of Trust Evaluation Methods