Peer trust evaluation using mobile agents in peer-to-peer networks

• US 7,213,047 B2
• Filed: 10/31/2002
• Issued: 05/01/2007
• Est. Priority Date: 10/31/2002
• Status: Active Grant

• Current Assignee: Oracle America, Inc. (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: Yeager, William J., Chen, Rita Y.
• Primary Examiner(s): Coulter; Kenneth R.
• Application Number:
  US10/285,133
• Publication Number:
  US 20040088369A1
• Time in Patent Office: 1,643 Days
• Field of Search: 709/202, 709/238, 709/240, 726 3- 15
• US Class Current: 709/202
• CPC Class Codes: H04L 67/04 specially adapted for terminals or networks with limited capabilities; specially adapted for terminal portability
• CPC Class Codes: H04L 67/104 Peer-to-peer [P2P] networks
• CPC Class Codes: H04L 67/1046 Joining mechanisms
• CPC Class Codes: H04L 67/1057 involving pre-assessment of levels of reputation of peers
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]

Abstract

Embodiments of a system and method for using mobile agents to gather trust information for evaluating trust in peer-to-peer networks. A peer node may launch a mobile agent on a network including an itinerary of peer nodes to be visited by the mobile agent and an indication of an area of interest. The mobile agent may determine if a visited peer node stores trust evaluations for other peer nodes as providers of codats relevant to the area of interest and, if so, the trust evaluations may be stored as payload data in the mobile agent. After completing the itinerary, the mobile agent may return the payload to the initiating peer node. The initiating peer node may use the trust evaluations collected by the mobile agent in determining or adjusting trust evaluations for peer nodes as providers of codats relevant to the area of interest.

Claims

1. A peer node, comprising:

a processor;

a memory comprising program instructions, wherein the program instructions are executable by the processor to;

generate a mobile agent including an itinerary indicating a plurality of peer nodes in the peer-to-peer network to be visited by the mobile agent and further including an indication of an area of interest of the initiating peer node; and

send the mobile agent to a first peer node of the plurality of peer nodes indicated by the itinerary;

wherein the mobile agent is configured to collect trust evaluations for a subset of the plurality of peer nodes as providers of codats relevant to the area of interest from one or more of the plurality of peer nodes indicated by the itinerary, wherein a codat is computer-representable content or data.

2. The peer node as recited in claim 1, wherein the program instructions are further executable by the processor to:

receive the mobile agent after the mobile agent has visited each peer node indicated by the itinerary; and

determine a trust evaluation for each of the subset of the plurality of peer nodes as a provider of codats relevant to the area of interest from the trust evaluations stored in the payload of the mobile agent.

3. The peer node as recited in claim 2, wherein the program instructions are further executable by the processor to select one or more of the subset of peer nodes for which corresponding trust evaluations are above a cooperation threshold as providers of codats relevant to the area of interest.

4. The peer node as recited in claim 3, wherein the initiating peer node and the selected one or more of the subset of peer nodes are configured to form a peer group for sharing codats relevant to the area of interest.

5. The peer node as recited in claim 1, wherein the program instructions are further executable by the processor to:

receive the mobile agent after the mobile agent has visited each peer node indicated by the itinerary; and

determine a trust evaluation for each of the subset of the plurality of peer nodes as a provider of codats relevant to the area of interest from the trust evaluations collected by the mobile agent and previous trust evaluations of the subset of the plurality of peer nodes as providers of codats relevant to the area of interest stored on the peer node.

6. The peer node as recited in claim 1, wherein, to collect trust evaluations for a subset of the plurality of peer nodes, the mobile agent is further configured to visit each of the plurality of peer nodes indicated by the itinerary.

7. The peer node as recited in claim 6, wherein the program instructions are further executable by the processor to, if the mobile agent is unable to visit one of the peer nodes indicated by the itinerary, reduce a trust evaluation for the one of the peer nodes as a provider of codats relevant to the area of interest.

8. The peer node as recited in claim 1, wherein the program instructions are further executable by the processor to:

receive the mobile agent from one peer node indicated by the itinerary;

remove and store one or more collected trust evaluations from the mobile agent; and

send the mobile agent to a next peer node of the plurality of peer nodes indicated by the itinerary.

9. The peer nodes as recited in claim 1, wherein the peer node and other peer nodes on the network are configured to implement a distributed trust mechanism for establishing and maintaining trust relationships among the peer nodes in areas of interest from trust evaluations of codat exchange among the peer nodes in the area of interest.

10. The peer node as recited in claim 9, wherein the program instructions are further executable by the processor to:

receive the mobile agent after the mobile agent has visited each peer node indicated by the itinerary; and

determine a trust evaluation for each of a subset of the plurality of peer nodes as a provider of codats relevant to the area of interest from the trust evaluations stored in the payload of the mobile agent in accordance with the distributed trust mechanism.

11. The peer node as recited in claim 1, wherein the peer node is configured to participate in a peer-to-peer environment with other peer nodes according to a peer-to-peer platform comprising one or more peer-to-peer platform protocols for enabling the peer nodes to discover each other, communicate with each other, find and exchange codats, and send and receive mobile agents to and from other peer nodes in the peer-to-peer environment.

12. A method, comprising:

an initiating peer node in a peer-to-peer network launching a mobile agent in the peer-to-peer network, wherein the mobile agent includes an itinerary indicating a plurality of peer nodes in the peer-to-peer network to be visited by the mobile agent, and wherein the mobile agent indicates an area of interest of the initiating peer node;

the mobile agent collecting trust evaluations for a subset of the plurality of peer nodes as providers of codats relevant to the area of interest from one or more of the plurality of peer nodes indicated by the itinerary, wherein a codat is computer-representable content or data; and

the initiating peer node determining a trust evaluation for each of the subset of the plurality of peer nodes as a provider of codats relevant to the area of interest from the trust evaluations collected by the mobile agent.

13. The method as recited in claim 12, wherein the mobile agent collecting trust evaluations for a subset of the plurality of peer nodes comprises the mobile agent visiting each of the plurality of peer nodes indicated by the itinerary.

14. The method as recited in claim 12, wherein the mobile agent collecting trust evaluations for a subset of the plurality of peer nodes comprises:

the mobile agent visiting a peer node on the itinerary;

the mobile agent determining if the visited peer node comprises one or more trust evaluations for one or more others of the plurality of peer nodes as providers of codats relevant to the area of interest; and

if the visited peer node comprises one or more trust evaluations for one or more others of the plurality of peer nodes as providers of codats relevant to the area of interest, storing the one or more trust evaluations as payload data in the mobile agent.

15. The method as recited in claim 14, wherein the mobile agent collecting trust evaluations for a subset of the plurality of peer nodes further comprises:

determining if the stored payload data has reached a size limit;

if the payload data has reached the size limit;

the mobile agent returning the payload data to the initiating peer node; and

the mobile agent visiting a next peer node on the itinerary.

16. The method as recited in claim 15, wherein the mobile agent collecting trust evaluations for a subset of the plurality of peer nodes further comprises, if the payload data has not reached the size limit, the mobile agent visiting the next peer node on the itinerary.

17. The method as recited in claim 12, wherein the mobile agent collecting trust evaluations for a subset of the plurality of peer nodes comprises:

storing the trust evaluations collected from the one or more of the plurality of peer nodes as payload data in the mobile agent; and

the mobile agent returning the payload data to the initiating peer node.

18. The method as recited in claim 12, wherein the mobile agent collecting trust evaluations for a subset of the plurality of peer nodes comprises:

the mobile agent collecting one or more trust evaluations from a first one or more of the plurality of peer nodes;

the mobile agent providing the trust evaluations collected from the first one or more of the plurality of peer nodes to the initiating peer node; and

the mobile agent repeating said collecting one or more trust evaluations from a next one or more of the plurality of peer nodes and said providing the trust evaluations collected from the next one or more of the plurality of peer nodes to the initiating peer node until the itinerary is completed.

19. The method as recited in claim 12, further comprising, if the mobile agent is unable to visit one of the peer nodes indicated by the itinerary, the initiating peer node reducing a trust evaluation for the one of the peer nodes as a provider of codats relevant to the area of interest.

20. The method as recited in claim 12, further comprising the initiating peer node selecting one or more of the subset of peer nodes for which corresponding trust evaluations are above a cooperation threshold as providers of codats relevant to the area of interest.

21. The method as recited in claim 20, further comprising the initiating peer node and the selected one or more of the subset of peer nodes forming a peer group for sharing codats relevant to the area of interest.

22. The method as recited in claim 12, further comprising the initiating peer node determining a trust evaluation for each of the subset of the plurality of peer nodes as a provider of codats relevant to the area of interest from the trust evaluations collected by the mobile agent and previous trust evaluations of the subset of the plurality of peer nodes as providers of codats relevant to the area of interest stored on the initiating peer node.

23. The method as recited in claim 12, wherein peer nodes in the peer-to-peer network are configured to implement a distributed trust mechanism for establishing and maintaining trust relationships among the peer nodes in areas of interest from trust evaluations of codat exchange among the peer nodes in the area of interest.

24. The method as recited in claim 23, wherein said determining a trust evaluation for each of the subset of the plurality of peer nodes as a provider of codats relevant to the area of interest from the trust evaluations collected by the mobile agent is performed in accordance with the distributed trust mechanism.

25. The method as recited in claim 12, wherein peer nodes in the peer-to-peer network are configured to implement a peer-to-peer environment according to a peer-to-peer platform comprising one or more peer-to-peer platform protocols for enabling the peer nodes to discover each other, communicate with each other, find and exchange codats, and send and receive mobile agents in the peer-to-peer environment.

26. A computer-readable storage medium comprising program instructions, wherein the program instructions are configured to implement:

an initiating peer node in a peer-to-peer network launching a mobile agent on the peer-to-peer network, wherein the mobile agent includes an itinerary indicating a plurality of peer nodes in the peer-to-peer network to be visited by the mobile agent, and wherein the mobile agent indicates an area of interest of the initiating peer node;

the mobile agent collecting trust evaluations for a subset of the plurality of peer nodes as providers of codats relevant to the area of interest from one or more of the plurality of peer nodes indicated by the itinerary, wherein a codat is computer-representable content or data; and

the initiating peer node determining a trust evaluation for each of the subset of the plurality of peer nodes as a provider of codats relevant to the area of interest from the trust evaluations collected by the mobile agent.

27. The computer-readable storage medium as recited in claim 26, wherein, in the mobile agent collecting trust evaluations for a subset of the plurality of peer nodes, the program instructions are further configured to implement the mobile agent visiting each of the plurality of peer nodes indicated by the itinerary.

28. The computer-readable storage medium as recited in claim 26, wherein, in the mobile agent collecting trust evaluations for a subset of the plurality of peer nodes, the program instructions are further configured to implement:

the mobile agent visiting a peer node on the itinerary;

the mobile agent determining if the visited peer node comprises one or more trust evaluations for one or more others of the plurality of peer nodes as providers of codats relevant to the area of interest; and

if the visited peer node comprises one or more trust evaluations for one or more others of the plurality of peer nodes as providers of codats relevant to the area of interest, storing the one or more trust evaluations as payload data in the mobile agent.

29. The computer-readable storage medium as recited in claim 28, wherein, in the mobile agent collecting trust evaluations for a subset of the plurality of peer nodes, the program instructions are further configured to implement:

determining if the stored payload data has reached a size limit;

if the payload data has reached the size limit;

the mobile agent returning the payload data to the initiating peer node; and

the mobile agent visiting a next peer node on the itinerary.

30. The computer-readable storage medium as recited in claim 29, wherein, in the mobile agent collecting trust evaluations for a subset of the plurality of peer nodes, the program instructions are further configured to implement, if the payload data has not reached the size limit, the mobile agent visiting the next peer node on the itinerary.

31. The computer-readable storage medium as recited in claim 26, wherein, in the mobile agent collecting trust evaluations for a subset of the plurality of peer nodes, the program instructions are further configured to implement:

storing the trust evaluations collected from the one or more of the plurality of peer nodes as payload data in the mobile agent; and

the mobile agent returning the payload data to the initiating peer node.

32. The computer-readable storage medium as recited in claim 26, wherein, in the mobile agent collecting trust evaluations for a subset of the plurality of peer nodes, the program instructions are further configured to implement:

the mobile agent collecting one or more trust evaluations from a first one or more of the plurality of peer nodes;

the mobile agent providing the trust evaluations collected from the first one or more of the plurality of peer nodes to the initiating peer node; and

the mobile agent repeating said collecting one or more trust evaluations from a next one or more of the plurality of peer nodes and said providing the trust evaluations collected from the next one or more of the plurality of peer nodes to the initiating peer node until the itinerary is completed.

33. The computer-readable storage medium as recited in claim 26, wherein the program instructions are further configured to implement, if the mobile agent is unable to visit one of the peer nodes indicated by the itinerary, the initiating peer node reducing a trust evaluation for the one of the peer nodes as a provider of codats relevant to the area of interest.

34. The computer-readable storage medium as recited in claim 26, wherein the program instructions are further configured to implement the initiating peer node selecting one or more of the subset of peer nodes for which corresponding trust evaluations are above a cooperation threshold as providers of codats relevant to the area of interest.

35. The computer-readable storage medium as recited in claim 34, wherein the program instructions are further configured to implement the initiating peer node and the selected one or more of the subset of peer nodes forming a peer group for sharing codats relevant to the area of interest.

36. The computer-readable storage medium as recited in claim 26, wherein the program instructions are further configured to implement the initiating peer node determining a trust evaluation for each of the subset of the plurality of peer nodes as a provider of codats relevant to the area of interest from the trust evaluations collected by the mobile agent and previous trust evaluations of the subset of the plurality of peer nodes as providers of codats relevant to the area of interest stored on the initiating peer node.

37. The computer-readable storage medium as recited in claim 26, wherein peer nodes in the peer-to-peer network are configured to implement a distributed trust mechanism for establishing and maintaining trust relationships among the peer nodes in areas of interest from trust evaluations of codat exchange among the peer nodes in the area of interest.

38. The computer-readable storage medium as recited in claim 37, wherein the program instructions are further configured to implement determining the trust evaluation for each of the subset of the plurality of peer nodes as a provider of codats relevant to the area of interest from the trust evaluations collected by the mobile agent in accordance with the distributed trust mechanism.

39. The computer-readable storage medium as recited in claim 26, wherein peer nodes in the peer-to-peer network are configured to implement a peer-to-peer environment according to a peer-to-peer platform comprising one or more peer-to-peer platform protocols for enabling the peer nodes to discover each other, communicate with each other, find and exchange codats, and send and receive mobile agents in the peer-to-peer environment.

40. A peer-to-peer network system, comprising:

an initiating peer node configured to;

generate a mobile agent including an itinerary indicating a plurality of peer nodes in the peer-to-peer network to be visited by the mobile agent and further including an indication of an area of interest of the initiating peer node; and

send the mobile agent to a first peer node of the plurality of peer nodes indicated by the itinerary;

the first peer node, configured to;

receive the mobile agent;

store trust evaluations for one or more of the plurality of peer nodes as providers of codats relevant to the area of interest in a payload of the mobile agent, wherein a codat is computer-representable content or data; and

send the mobile agent to a next peer node of the plurality of peer nodes indicated by the itinerary.

41. The peer-to-peer network system as recited in claim 40, wherein each of the plurality of peer nodes on the itinerary is configured to:

receive the mobile agent;

if the peer node comprises trust evaluations for one or more of the plurality of peer nodes as providers of codats relevant to the area of interest, store the trust evaluations in the payload of the mobile agent; and

send the mobile agent to a next peer node of the plurality of peer nodes indicated by the itinerary.

42. The peer-to-peer network system as indicated in claim 41, wherein the initiating peer node is further configured to:

receive the mobile agent after the mobile agent has visited each peer node indicated by the itinerary; and

determine a trust evaluation for each of a subset of the plurality of peer nodes as a provider of codats relevant to the area of interest from the trust evaluations stored in the payload of the mobile agent.

43. The peer-to-peer network system as recited in claim 41, wherein the initiating peer node is further configured to, if the mobile agent is unable to visit one of the peer nodes indicated by the itinerary, reduce a trust evaluation for the one of the peer nodes as a provider of codats relevant to the area of interest.

44. The peer-to-peer network system as recited in claim 41, wherein the initiating peer node is further configured to select one or more of the subset of peer nodes for which corresponding trust evaluations are above a cooperation threshold as providers of codats relevant to the area of interest.

45. The peer-to-peer network system as recited in claim 44, wherein the initiating peer node and the selected one or more of the subset of peer nodes are configured to form a peer group for sharing codats relevant to the area of interest.

46. The peer-to-peer network system as recited in claim 40, wherein the initiating peer node is further configured to:

receive the mobile agent after the mobile agent has visited each peer node indicated by the itinerary; and

determine a trust evaluation for each of the subset of the plurality of peer nodes as a provider of codats relevant to the area of interest from the trust evaluations collected by the mobile agent and previous trust evaluations of the subset of the plurality of peer nodes as providers of codats relevant to the area of interest stored on the initiating peer node.

47. The peer-to-peer network system as indicated in claim 40, wherein the last of the plurality of peer nodes on the itinerary is configured to:

receive the mobile agent;

if the last peernode comprises trust evaluations for one or more of the plurality of peer nodes as providers of codats relevant to the area of interest, store the trust evaluations in the payload of the mobile agent; and

send the mobile agent to the initiating peer node.

48. The peer-to-peer network system as recited in claim 40, wherein each of the plurality of peer nodes on the itinerary is configured to:

receive the mobile agent;

if the peer node comprises trust evaluations for one or more of the plurality of peer nodes as providers of codats relevant to the area of interest, store the trust evaluations in the payload of the mobile agent; and

determine if the stored payload data has reached a payload size limit;

if the payload data has reached the payload size limit, send the mobile agent to the initiating peer node; and

if the payload data has not reached the payload size limit, send the mobile agent to the initiating peer node, send the mobile agent to a next peer node of the plurality of peer nodes indicated by the itinerary.

49. The peer-to-peer network system as recited in claim 48, wherein, if the payload data has reached the payload size limit, the initiating peer node is further configured to:

receive the mobile agent;

remove and store the payload data from the mobile agent; and

send the mobile agent to the next peer node of the plurality of peer nodes indicated by the itinerary.

50. The peer-to-peer network system as recited in claim 40, wherein peer nodes on the network are configured to implement a distributed trust mechanism for establishing and maintaining trust relationships among the peer nodes in areas of interest from trust evaluations of codat exchange among the peer nodes in the area of interest.

51. The peer-to-peer network system as recited in claim 50, wherein the initiating peer node is further configured to:

receive the mobile agent after the mobile agent has visited each peer node indicated by the itinerary; and

determine a trust evaluation for each of a subset of the plurality of peer nodes as a provider of codats relevant to the area of interest from the trust evaluations stored in the payload of the mobile agent in accordance with the distributed trust mechanism.

52. The peer-to-peer network system as recited in claim 40, wherein peer nodes on the network are configured to implement a peer-to-peer environment according to a peer-to-peer platform comprising one or more peer-to-peer platform protocols for enabling the peer nodes to discover each other, communicate with each other, find and exchange codats, and send and receive mobile agents in the peer-to-peer environment.