Incentives: Difference between revisions
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Simple point incentive mechanisms as in e.g. the [[The Maze Peer-To-Peer System|Maze]]-network don't prevent users from cheating. Two kinds of user collusion are observed. |
Simple point incentive mechanisms as in e.g. the [[The Maze Peer-To-Peer System|Maze]]-network don't prevent users from cheating. Two kinds of user collusion are observed. |
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*'''Pair-wise collusion''' |
*'''Pair-wise collusion''' |
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Two users mutually exchange large amounts of data to increase their points. This kind of collusion profits from the rule that uploading earns more points that downloading consumes. |
:Two users mutually exchange large amounts of data to increase their points. This kind of collusion profits from the rule that uploading earns more points that downloading consumes. |
||
*'''Spam account collusion''' |
*'''Spam account collusion''' |
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A user registers a number of spam-accounts to download from his main-account. Thus he transfers initial points given to new accounts to his main-account. |
:A user registers a number of spam-accounts to download from his main-account. Thus he transfers initial points given to new accounts to his main-account. |
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== EigenTrust == |
== EigenTrust == |
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Revision as of 06:50, 26 July 2007
Problem
File-sharing networks like KaZaA and Gnutella have popularized the peer-to-peer (P2P) resource sharing model. Based on the altruistic behaviour of its users, principles of P2P systems sometimes conflict user's rational individuality. The individual's utility function is also influenced by negative factors like e.g. upload costs, limited upload bandwidth, enviousness or egoism. Hence some users use P2P networks without sharing own resources (free-riding).
Incentive systems
Point incentive system
Simple point incentive mechanisms as in e.g. the Maze-network don't prevent users from cheating. Two kinds of user collusion are observed.
- Pair-wise collusion
- Two users mutually exchange large amounts of data to increase their points. This kind of collusion profits from the rule that uploading earns more points that downloading consumes.
- Spam account collusion
- A user registers a number of spam-accounts to download from his main-account. Thus he transfers initial points given to new accounts to his main-account.
EigenTrust
coming soon
Tit-for-Tat
coming soon