Research On Multi-Negotiation Targets In ATN Over TrustBuilder2Framework

Computer networks such as P2P (Peer to Peer) network in which each peer in thenetwork can act as a client or server for the other computers in the network allowing sharedaccess to services or files which are considered as negotiation targets. Before granting anaccess to negotiation target it requires the establishment of trust. Automated Trust Negotiation(ATN) was one of approaches to establish trust between unknown peers by exchange digitalcredentials guiding by access control policy of negotiation target. Trust negotiation isestablished every time before granting an access to negotiation target. When the number ofnegotiation target is increasing, the existing ATN approaches are not suitable enough for P2Pnetwork because all trust negotiations are performed separately and sequentially one-by-onewhich make the negotiation time is longer and data transfer is not minimized due to theoccurrence of duplicate disclosures and inability of simultaneous trust negotiation processing.Therefore fastening the speed of negotiation time and minimizing data transfer is primeconcern of the research to improve the availability of peers’ service and minimize trafficcongestion in P2P network.The elimination of the duplicate disclosures was on focus, and demonstrated throughdesign of the proposed concept of Common Disclosure (CD). Every credential that has beendisclosed in every negotiation step is accumulated into global repository CD. Beforedisclosing credentials or policies, every negotiation step must check CD first to assure that itwill not disclose duplicate disclosures. Another focus of this research is changing the way ofnegotiation processing from sequentially one-by-one to simultaneously. Client can sendmultiple requests to grant access to negotiation targets and the results of negotiation targetscan be notified as soon as possible. This idea demonstrated through design of the proposedconcept of Redefinition of Messages. The perfect combination of two proposed conceptsbrings about the novel approach of ATN called “Combined ATN” which affected the changesof the existing negotiation protocols and strategies to handle multi-negotiation targetsefficiently.The Combined ATN was implemented and verified over TrustBuilder2Framework inwhich some components of system module were modified. All credentials were uncertified credentials and all policies were defined using Java Expert System Shell, a rule engine forThe JAVA platform. The CLOUSEAU Compliance Checker was used to find all satisfyingsets of credentials for a given policy. The experiments were conducted to compare theaverage negotiation time and the average data transfer between the original and the modifiedTrustBuilder2Framework. The experiment results show that the Combined ATN is able toreduce negotiation time and minimize data transfer which imply that the Combined ATN is anefficient approach and is recommended to be used instead of the existing ATN approacheswhen dealing with multi-negotiation targets.