Trust - Peer-to-Peer Computing: Applications, Architecture, Protocols, and Challenges - page 155

TABLE 6.3: A qualitative comparison of different trust management ap-
proaches for P2P systems.

Local Global Convergence Trust Message Structured

Evaluation Aggregation Rate Accuracy Overhead Network

Azzedin and
Maheswaran
[Azzedin and
Maheswaran,
2003]

Ratings
sum

Combined
with recom-
mender's
scores

Fast Moderate High Yes

EigenTrust
[Kamvar
et al., 2003]

Ratings
sum

Iterative Fast High Moderate Yes

PeerTrust
[Xiong

Normalized
ratings sum

Local compu-
tation based
on 5 factors

Fast High Moderate Yes

and

Liu, 2004]

FuzzyTrust
[Song

Fuzzy based Fuzzy based Fast High Moderate Yes

et al.,

2005]

SuperTrust
[Dimitriou
et al., 2007]

Ratings
sum

Combined
with recom-
mender's
scores

Fast High High Yes

PowerTrust
[Zhou

Bayesian LRW based Fast High Low Yes

and

Hwang,
2007b]

GossipTrust
[Zhou

Ratings
sum

Gossip based Fast High Low No

and

Hwang,
2007a]

2007, Xu et al., 2007, Zhang and Fang, 2007]. The reader is highly encouraged
to study these recent results.
Finally, we have also surveyed in detail practical trust establishment
schemes for wireless sensor networks.

6.13 Review Questions
1. What are the essential components of a P2P trust scheme?

2. What are the salient features of the EigenTrust system?

3. How do you compare EigenTrust and PeerTrust?

4. What is the relationship between a trust system and a reputation sys-
tem?

5. What are the impacts of selfishness in the effectiveness of a trust system?

6. What are the most vulnerable components in a trust system?