Autonomic Trust Management for a Component-Based Software System

[Publication 7] Zheng Yan and Ronan MacLaverty, “Autonomic Trust Management in a Component Based Software System”, In Proceedings of the 3rd International Conference on Autonomic and Trusted Computing (ATC2006), LNCS Vol. 4158/2006, pp. 279-292, China, September 2006. © 2006 Springer Science + Business Media. Reprinted with kind permission of Springer Science and Business Media. http://www.springerlink.com/openurl.asp?genre=article&id=doi:10.1007/11839569_27 {zheng.z.yan, ronan.maclaverty}@nokia.com ! ! " % # ! $ " " % " + ! & '() %* %* $ " + % ( "# $ '( ! % ! ! , % " , $ $ $ ! $ % ! % " " ! - + $ % $ " " " '( $ ! " ) ! ! " 4 &, 012% " %. ! % !! / "$ $ ! " "# 3 % $ ! " " % " + ! , ! 062% 7 $ %5 " ( " + $ $ 6 % % 062% ! , % 8 (: . 092 ! 8 % ! " " % ! ! $ % $ " " " % . ! '( % " $ ! ! '( " %* " ! ! $ $ % " ! " ! ! ! " $ '(% $ ! '( % " 4 '( $ ! ! + $ $ $ " % 3 % ( !%( 6 " 9 '( %( ; ! $ % ! 8 '( ( ! <% 3 ! 4 % ! + ! ! ! % " ! , % $ ! ! + ! ! % ! + $ 4 %. 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" &I ! % &. ! ! # )G / )G / 5 4 / , % % " " % " " " 4 )G " & 6% 1) H& % 4 " 6 " . I ! & &5 ! $ + % 4 ! ) G " ! $ % &6) 6/ , " $ % 4 )G ! $ " " , . , " %8 " / + " & " " , " " & ) $ % $ " 1% " %8 " %' " " ) " ! " 1% 8 " " ! , " " % " " !% Initialization te: the assessed target (a system or subsystem or a service) py(to, ir, ep, cr): the policy on te: ? B; ? 6- & ? 1 %%% ) op(qa_i) = (0,0,1); op(te) = (0,0,1) 1. Monitor te’s performance regarding te’s quality attributes in specified period t. 2. For ? & 1 %%% ) , If the monitored result is better than Else, ? ? & 3. For & % % ? ) 1 %%% ) , calculate the opinion: & ? ? ? ). ? , ? ; . ' ( ! ( 11 4. Based on the importance rates on different attributes, calcu- & ) late a combined opinion: & ? ? ) % 1 & ) 5. If % make trust decision; else, make distrust de- cision. "" # . % $ " 4 % " " ! " " , ! ! $ % 4 % $ % $ 4 ! " % ! ! $ ! $ " " %8 % " " 4 ! " " $ % " " ! + $ $ $ % " %' " 1% 8 " " &' " " " % . " %. " 1% % 8 ! " " ! " % " ! " ! ! %8 %' " " " " ! " $ " ! % $ $ " " !% Initialization Considering ATM = (TR,TA,AO) ' ? & 1 %%% ) : the trust management operations applied for TR 16 % % ? ? B; 6; & ? 1 %%% ) op = op(ao_i) = (0,0,1) py(to, ir, ep, cr): the policy on AO : the set of selected operations At the Mechanism Base, generate opinions on operations 1. Do trust assessment, if ' 1, & ? 1 %%% ) Else, find the operations po_i that cause the problems: ? & " & ? , 2. For 3. If 1 %%% 7 ) & " % & ' ), ? ) & ? ) or ? & ? ? ? 1 %%% 7 )- ? " ) ' 1 , put ao_i (with opinion below ? & threshold) or po_i into a set 1 %%% ) , upgrade these operations in RO with better ones At the Selection Engine, select suitable operations. For each composition of a set of upgrading operations CO, do 3.1 Get existing opinions of new selected operations supported by the system op(co_j) (j=1,...,m) 3.2. Aggregate above opinions & ? 8) & ? ) & 8 1 %%% )& 1 %%% ) ? ' % , add CO into S 3.3. If 3.4. 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