Reputation systems

1. Reputationsystems Jaime Pérez <jaime.perez@rediris.es>

2. Reputation 1. The estimation in which one is held; the character attributed to a person, thing, or action;

3. Aims: • Develop new architectures and services based on reputation systems. • Enhance existing services by adding the concept of reputation. • Find different, efficient ways of representing and using reputation.

4. Examples: • Spam fighting: use reputation as an indicator to include IP addresses into white/black lists. • Efficient use of the network: use reputation in peer-to-peer networks to avoid misuse.

5. White/black listing • People include IPs in the white list. • Periodic automated checks to move IPs between lists. • The white list is used to purge the black list. • The black list is checked by the MTAs by querying a DNS zone. • Binary reputation!

6. Reputation in P2P • The behaviour of the peers is monitored. • The reputation of a peer is used to decide whether to share something with him or not. • Based on federation technology to identify peers and track their reputation.

7. Open Reputation Management Systems • OASIS Technical Committee • Focused on reputation technologies. • Working on terminology and use cases.

8. Work items • Start sharing white/black lists in an automated way (federation?). • Start a pilot of a P2P based on reputation technology. • …