CN101714100A - Trust negotiation constructing method for internetware main body system under dynamic interaction network environment - Google Patents
Trust negotiation constructing method for internetware main body system under dynamic interaction network environment Download PDFInfo
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- CN101714100A CN101714100A CN200910232490A CN200910232490A CN101714100A CN 101714100 A CN101714100 A CN 101714100A CN 200910232490 A CN200910232490 A CN 200910232490A CN 200910232490 A CN200910232490 A CN 200910232490A CN 101714100 A CN101714100 A CN 101714100A
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Abstract
The invention discloses an trust negotiation constructing method for an internetware main body system under a dynamic interaction network environment, relates to a method for constructing automatic trust negotiation for an internetware main body system under a dynamic network environment and a structural situation, and provides an automatic trust negotiation method forthe internetware main body system suitable for a dynamic network interaction situation. The method is realized in such a way that each internetware main body owns the respective information i.e. trust and cooperation, and two main bodies requiring cooperation select the corresponding trust level and cooperation level (fitness) to establish the trust relationship according to the cooperation direction; whether the trust relationship is successfully established or not requires to be compared with the reference value, and the reference value is the calculation value based on the fitness when the main body in the system owns the average trust information; when the fitness is greater than the reference value, the trust relationship is established. The method avoids the trouble brought by using certificate, and the establishment of the trust relationship is simple and clear.
Description
Technical field
The present invention relates to the structure of method of network configuration software Agent (main body) the system automated trust negotiation of dynamic network environment and structuring situation, specifically, relate to a kind of method of utilizing the trust information of Software Agent in the interactive structure mechanism of breaking the wall of mistrust.
Background technology
Network configuration software is that this type systematic is support with the software component technology towards opening, dynamic, changeable a kind of software systems of Internet (the Internet) running environment, constructs by interconnection, cooperation and the alliance of autonomous, open service entities.Internetware system generally includes a large amount of software agents, and these software agents cooperate with each other and finish the work.Network configuration software Agent can carry out rational accommodation according to the concrete variation of environment in operational process, with the function that satisfies dynamic environment and the requirement of quality.
In the environment of the dynamic opening of Internet, the cooperation of Software Agent is undertaken by certain network structure in the internetware system.The dynamic that important feature is exactly a network structure of Internet, in service at network, topological structure often changes, and constantly has new node to add or existing node withdraws from, and also has the annexation between the node also can change.The change that connects between the node had both comprised that the change of physics also comprised the change of logic.The dynamic topology network is a new principal character of present Internet network, and interactive collaboration is finished the work between the network configuration software Agent in the network structure of this dynamic change, must have one strong and effectively faith mechanism realize.
The trust security mechanism of Software Agent mainly contains center faith mechanism and distributed trust mechanism.The center faith mechanism needs a central controller to control visit and information stores safety; This mode is fixed and simply, is still needed the support of network infrastructure, so be difficult to adapt to the dynamic topology and the movement requirement of network.This faith mechanism is difficult to satisfy Software Agent system dynamics and ambulant demand.And in distributed trust mechanism, do not need a central controller to come management information, and can the relation of breaking the wall of mistrust mutually between the Software Agent, the Software Agent the two sides concerned determines by exchange digital certificate relation of breaking the wall of mistrust and access control; This faith mechanism has been avoided the defective of center faith mechanism to a certain extent, reduces the dependence to grid foundation structure, can more effectively adapt to the dynamic topology network comparatively speaking.An essential characteristic of Internet platform is exactly opening and the dynamic that node connects, because the variation of network topology structure, obviously the trust mode that operates in the multi-Agent internetware system on this network foundation also needs this variation of self-adaptation, thereby the faith mechanism of multi-Agent can be adapted with current network topology structure.So being applied in, distributed trust mechanism still has a lot of defectives in the dynamic network structure.At first, be used for the digital certificate that distributed trust mechanism exchanges and comprising personal attribute information, these information all are sensitive informations, so may cause the sudden change of attribute information because of the variation of Internet network environment and structure thereby impel trusting relationship to set up failure in the process of certificate is provided.Secondly, in distributed trust mechanism, the exchange of each Software Agent certificate all has an access control policy, and the attribute information when having only the access control policy condition to satisfy above the certificate just comes out, thereby has increased the complicacy that trusting relationship is set up; At last, in distributed trust mechanism in the Software Agent relation of at every turn breaking the wall of mistrust, certificate that all needs to provide essential again or password etc., waste resource and time.
Summary of the invention
Technical matters: the objective of the invention is to propose a kind of internetware main body system under dynamic interaction network environment trust negotiation constructing method, Software Agent has avoided the use certificate exchange to cause trust negotiation to become complicated loaded down with trivial details according to the trust information relation of breaking the wall of mistrust of oneself in this method; And this method does not need Agent to rebulid trusting relationship alternately more at every turn, and by between the Software Agent constantly information interaction make each Software Agent progressively have the overall situation trust information.
Technical scheme: in the environment of the dynamic opening of Internet, the cooperation of Software Agent is finished in certain network structure in the internetware system, be in the mutual of Software Agent in the structured environment and make each Agent that the certain social status all be arranged with cooperating, social status is that the interactive relation by Software Agent and other Agent determines.Between the Agent interactive collaboration must have one strong and effectively faith mechanism realize.Cooperative relationship in the internetware system between each Software Agent and trusting relationship are oriented, and the direction of the trusting relationship that cooperation will make up is opposite with the direction of its cooperative relationship just.The relation of breaking the wall of mistrust alternately of Agent can represent that for example example is shown in Figure 1 with the form of figure in the software systems; In the system Agent constantly just formed this oriented trusting relationship figure alternately, in this graph of a relation, oriented relation is represented trusting relationship, that is, initial point is trusted the relation of terminal point.The main technical schemes of this method is as described below:
In the Software Agent system, each Software Agent all has the trust information of oneself---degree of belief and cooperation degree, two Agent of cooperation select the corresponding relation of breaking the wall of mistrust according to the passive relation of master of cooperation, degree of belief and cooperation degree sum are referred to as compatible degree, the foundation of trusting relationship need with reference value relatively, when compatible degree relation of breaking the wall of mistrust during greater than this reference value.
Each Software Agent all has the trust information of oneself, and the size of trust information embodies by degree of belief and cooperation degree, and wherein: the degree of belief of Software Agent is defined as p*m*T (t), wherein m=T (t)/(T (t)+C (t)); The cooperation degree of Software Agent is defined as n*p ' * C (t), n=C (t)/(C (t)+T (t)) wherein, the number of times that T (t) is trusted for t moment Software Agent, the number of times that C (t) trusts others for t moment Software Agent, p and p ' are respectively the feedback factor of Software Agent trust and cooperation.
Setting up feedback factor p in relevant degree of belief and the cooperation degree and p ' with trusting relationship between the Software Agent is the Software Agent prestige feedback factor when concerning that breaks the wall of mistrust, do not have cheated Probability p when representing other Agent respectively to this Software Agent trusting degree p and cooperation ', wherein:
The number of times that T in the formula (t) expression t moment Software Agent i is trusted, r
k(t) situation of expression Agentk trust Agenti, wherein
K/k=1,2 ..., T (t) };
R in the formula
l(t) the cooperation situation of expression t moment Agenti and co-worker Agentl, the number of times that C (t) expression t moment Software Agent i trusts others, wherein
L/l=1,2 ..., C (t) }.
Two Software Agent of cooperation are set up cooperative relationship according to the primary and secondary status of cooperation, cooperative relationship and trusting relationship are oriented and unidirectional, Software Agent i need cooperate with Agentj, and cooperative relationship is set up direction and is: i → j, and trusting relationship set up direction Agentj → Agenti; The main main body of cooperation is Agenti, the i status that has the initiative, and Agentj then is in passive position.
We are defined as compatible degree with the cooperation degree sum of Agenti degree of belief and Agentj, and the success or not of two main bodys then cooperating relation of breaking the wall of mistrust is relevant with the compatible degree size; The size of compatible degree f (t) is f (t)=p
i* m*T
i(t)+p
j' * n*C
j(t); Whether trusting relationship is successfully by relatively determining with the compatible degree reference value between the software agent.
The foundation of trusting relationship need be relevant with reference value between the software agent, this reference value is the compatible degree reference value, this reference value is the compatible degree size of calculating when main bodys have average trust information in the system, the relation of breaking the wall of mistrust when greater than this reference value, and choosing of this reference value meets human cooperation group psychology in the social psychology.
Beneficial effect:
(1) increases the support that does not need central processing unit and network infrastructure in this trust method of cooperation validity, do not need to provide certificate and threshold cryptography etc. yet, so avoided in the building process of trust information, occurring the imperfect or failure that breaks the wall of mistrust when being distorted of certificate information, reduce the probability of setting up wrong trusting relationship with other Software Agent, increase the validity of cooperation.
(2) satisfy that trusting relationship is to set up according to the cooperation demand of internetware system in the structuring situation between the real-time, interactive Software Agent, so constantly make the foundation of Agent trusting relationship have more real-time alternately between the Software Agent; This method can satisfy the dynamic change of Agent system, and continuous interactive collaboration makes each Software Agent finally have the trust information of the overall situation between the Software Agent.
(3) save the autonomous characteristic that this method of cost consumption has been utilized Software Agent, and the relation of breaking the wall of mistrust during logging software Agent cooperation, the relation that all breaks the wall of mistrust when not needing each cooperation need rebulid costs such as the resource of new trusting relationship and time again when so just having saved when distributed trust mechanism each cooperation.
(4) adapt to the not support of needs network infrastructure of this trust method of dynamic, thereby reduced dependence, thereby more adapt to the requirement of the dynamic change of network topology structure the internetware system network infrastructure.
Description of drawings
Fig. 1 is the mutual trust information example displayed map of Software Agent.
Fig. 2 is the maximum trust and the cooperation degree Software Agent synoptic diagram of this method definition in the example.
Fig. 3 is the final global trusting information relationship figure that example adopts this method.In the figure, solid line partly is original trusting relationship, and dotted portion is the final trusting relationship figure that sets up.
Fig. 4 is the cardinal principle figure of the inventive method.
A in above-mentioned accompanying drawing
1, a
2..., a
10All identical, represent one group of Software Agent, wherein index number 1,2,3 ..., the sequence number of 10 expression Software Agent.
Embodiment
(1) in the network configuration software structure of dynamic interaction, the in-degree of any one Software Agent i is many more, the number of times of being trusted is many more, the prestige that this point is described is high more, prestige is good more, thereby other Software Agent are more prone to write to appoint it, so easier relation of breaking the wall of mistrust: for the reliability of the relation that guarantees to break the wall of mistrust, Software Agent of each relation of breaking the wall of mistrust with it all can be fed back the foundation of current trusting relationship, shown in being set as follows of feedback function:
At moment t, the number of times of being trusted in the trust information of Software Agent i is T (t), and their feedback function is r
k(t) (k=1,2 ..., T (t)), then
Related software Agent has relation to its feedback function value in the fine or not degree of Software Agent i prestige and its trust information, and the definition value of feedback is a feedback factor p
i, p then
iFor:
In this formula, p
iRepresent the trust situation of other Agent to Software Agent i; r
j(t) be t feedback function constantly, Agentj is to the trust feedback of Software Agent i; ∑ r
j(t), (j=1,2 ..., T (t)), represent then in all Agenti trustor that Software Agent i does not produce the Agent number of malicious act to it; T (t) is the t quantity of all trustor of Agenti constantly.
We adopt the definition of degree of belief to represent the prestige of Software Agent i in the network configuration software structure, and Software Agent i degree of belief is p
i* m*T
i(t), m=(Agenti. in-degree)/(Agenti. out-degree+Agenti. in-degree)=T wherein
i(t)/(C
i(t)+T
i(t)); In Fig. 1, the point of degree of belief maximum is a
5
(2) in like manner, in the internetware system of structuring sight and dynamic change, the out-degree information of Software Agent j is many more, and it is many more to represent that then Software Agent j trusts other degree of nodes, illustrates that Software Agent j believes other Software Agent easily; Therefore the easier Software Agent with other of Software Agent j is set up cooperation, that is: to trust other degree of nodes many more for Software Agent j, and the possibility of cooperation is just big more; The possibility of being cheated for fear of Software Agent j increases, so the relation of breaking the wall of mistrust is to need the feedback of consideration to the Software Agent of its cooperation, feeds back as follows:
It is C (t) that Software Agent j trusts other degree of node at moment t, and is r in this moment to the feedback function of the node of its trust
l(t) (l=1,2 ..., C (t)),
And define the involutory feedback factor p that makes the cooperation situation of object of Agentj again
j',
In this formula, p
j' be the feedback factor of Software Agent j cooperation, the probability that expression Software Agent j is not cheated in all cooperations.If p
j' bigger, be illustrated in that to be subjected to cooperation object deception in cooperation fewer with Agentj; The same with above-mentioned expression, r
l(t) be t feedback function constantly, promptly Software Agent j is to the trusted situations feedback of request cooperation object Agentl; ∑ r
l(t), (j=1,2 ..., C (t)), then represent the quantity of the non-malice Agent of all cooperation objects of Agentj; C (t) then is illustrated in all co-worker's quantity that break the wall of mistrust and concern with Agentj of t constantly.
If the possibility that this Software Agent j is broken the wall of mistrust is called the cooperation degree, Software Agent j cooperation degree is exactly n*p so
j' * C
j(t), n=(Agentj. out-degree)/(Agentj. out-degree+in-degree)=C
j(t)/(C
j(t)+T
j(t)), in Fig. 1, the point of cooperation degree maximum is a
8
(3) therefore, Software Agent i and Agentj cooperate and need break the wall of mistrust when concerning in the network configuration software Agent system of dynamic network environment and structuring situation, the cooperation degree of Software Agent j must very high ability easier with the Agenti relation of breaking the wall of mistrust, the two structure trusting relationship possibility is defined as the compatible degree of the two with them.I need cooperate with Agentj in moment t Software Agent, compatible degree f (the t)=p of the two
i* m*T
i(t)+p '
j* n*C
j(t), p, m, p in this functional expression
j', the implication of n representative is consistent with above-mentioned meaning, T
i(t) then be illustrated in the Software Agent quantity of t trust Agenti constantly, C
j(t) then be illustrated in the Software Agent quantity that moment t cooperates with Agentj.
It is relevant with choosing of f ° of compatible degree reference value whether trusting relationship successfully constructs, we select compatible degree value that Software Agent contains in the internetware system average information calculates as with reference to f ° of value, and the selection of this reference value meets the group psychology of human behavior in the social psychology; In internetware system, if f (t) more than or equal to this value, we just think to trust and set up successfully.As mentioned above, compatible degree is big more, and then the possibility of the two cooperation is big more; Compatible degree is low more, and the possibility of cooperation reduces, and Software Agent such as Fig. 2 of degree of belief and cooperation degree maximum show.
Under the dynamic interaction environment based on the network configuration software Agent system trust negotiation constructing method of degree of belief, the cardinal principle of the Software Agent relation of breaking the wall of mistrust as shown in Figure 4, embodiment is: in the example trusting relationship of network configuration software Agent system software Agent as shown in Figure 1, the cooperative relationship of Agent is as shown in table 1; So this network configuration software Agent system software Agent break the wall of mistrust the relation reference value f °=1.9, in this example Software Agent break the wall of mistrust the relation step be:
(1) adopt the system cooperating between the manager M management software Agent to concern that cooperative relationship is as shown in table 1.
(2) each Software Agent storage trust information directly related with them;
(3) two Software Agent a that from M, select needs to cooperate at random
1, a
2Call two Software Agent own original trust information, { a are all arranged
1a
4, a
1a
5, a
2a
1, a
3a
1, { a
2a
1, a
2a
4, a
3a
4;
(4) check and to need the Software Agent cooperated whether can the relation of breaking the wall of mistrust directly or indirectly in (2); If could the relation that directly breaks the wall of mistrust; If fruit does not have, then need the two automated trust negotiation relation of breaking the wall of mistrust, the new relation that makes up of storage.
Wherein, indirectly the foundation of trusting relationship is that transmission by trusting relationship between the Software Agent realizes; The foundation of automated trust negotiation then be trust information according to the two sides concerned, calculate their degree of belief, cooperation degree and compatible degree respectively, then with comparison of compatible degree reference value and then the relation of breaking the wall of mistrust.
Because a
1With a
2The trusting relationship that cooperation need be set up is a
2→ a
1, in (3), can find direct trusting relationship, then do not need to consult the mechanism that breaks the wall of mistrust;
(5) two Software Agent that selection need be cooperated from manager M again, repeating step (2), (3), (4) relation of breaking the wall of mistrust.
For example, select cooperative relationship a
1a
8, from (1), call their trust information a respectively
1: { a
1a
4, a
1a
5, a
2a
1, a
3a
1, a
8: { a
8a
5, a
8a
7, a
8a
9, a
8a
10; Check a
1a
8Trusting relationship find there not be the existence of trusting relationship directly or indirectly, then need the mechanism that breaks the wall of mistrust of negotiation automatically;
The process of the foundation of automated trust negotiation is: according to the trust information of the two sides concerned, calculate their degree of belief, cooperation degree and compatible degree respectively, then with comparison of compatible degree reference value and then the relation of breaking the wall of mistrust.We think that all Software Agent all are Agent of non-malice in this example, and Software Agent is 1 to the confidence rate of trustor.Therefore calculate a
1Degree of belief be 2*2/ (2+2)=1, a
8The cooperation degree be 4*4/ (4+0)=4, compatible degree f=5 so; With itself and reference value f ° comparison, f＞f °; A so
1, a
8Trust successfully constructs, and a
1Write down this trusting relationship.
(5) continue from table 1, to select cooperative relationship, until the foundation of finishing the global trusting information relationship.
Repeatedly after the cooperative relationship of option table 1, final global trusting information relationship figure that sets up of this example and chart are shown in Fig. 3, table 2.In Fig. 3, solid line partly is original trusting relationship, and dotted portion is the final trusting relationship figure that sets up, and like this, two parts have been formed overall trust information figure.In the table 2, one has 53 cooperative relationship, and the trusting relationship that success is set up is 48, has only 5 not set up successfully, and adopting the success ratio of this mechanism construction trusting relationship in this example is 90.6%.
All cooperative relationship tables of the Software Agent of an example of table 1 this method
Table 1 expression row Agent and the cooperative relationship that is listed as Agent, Software Agent is the main main body of cooperation on the line direction, the status that has the initiative, the Agent on the column direction then is in passive position in cooperation; Two Agent of in the table ' 1 ' expression have cooperative relationship, and ' 0 ' then represents not have cooperative relationship.
Table 2 global trusting relation table
"+" representative in the table 2 breaks the wall of mistrust and concerns successfully, and is unsuccessful when "-" representative makes up trusting relationship; The cooperative relationship of a line display Software Agent above in each cooperation, a following line display has the success or not that breaks the wall of mistrust and concern between the Software Agent of cooperative relationship; Form does not have cooperative relationship for empty expression.
Claims (6)
1. internetware main body system under dynamic interaction network environment trust negotiation constructing method, it is characterized in that this method comprises: each software agent all has trust information-degree of belief and the cooperation degree of oneself, two main bodys of cooperation are selected corresponding degree of belief and the cooperation degree relation of breaking the wall of mistrust according to the passive relation of master of cooperation, the foundation of trusting relationship need be compared the relation of breaking the wall of mistrust during greater than this reference value with reference value.
2. a kind of internetware main body system under dynamic interaction network environment trust negotiation constructing method according to claim 1, it is characterized in that: each software agent all has the trust information of oneself, the size of trust information embodies by degree of belief and cooperation degree, wherein: the degree of belief of software agent is defined as p*m*T (t), and m=T (t)/(T (t)+C (t)); The cooperation degree of software agent is defined as n*p ' * C (t), and n=C (t)/(C (t)+T (t)), the number of times that T (t) is trusted for t moment software agent, the number of times that C (t) trusts others for t moment software agent, p and p ' are respectively the feedback factor of software agent trust and cooperation.
3. a kind of internetware main body system under dynamic interaction network environment trust negotiation constructing method according to claim 2, it is characterized in that: the foundation of trusting relationship is relevant with the cooperation degree with their degree of belief between the software agent, do not have cheated Probability p when the Probability p of the non-malice of main body and cooperation were spent when feedback factor p in degree of belief and the definition of cooperation degree and p ' were software agent calculating degree of belief respectively ', wherein:
4. a kind of internetware main body system under dynamic interaction network environment trust negotiation constructing method according to claim 1, it is characterized in that: two software agents of cooperation are set up cooperative relationship according to the passive relation of master of cooperation, cooperative relationship and trusting relationship are oriented and unidirectional, software i need cooperate with j, cooperative relationship is set up direction: i → j, and trusting relationship set up direction j → i; The main main body of cooperation is main body i, the i status that has the initiative, and main body j then is in passive position.
5. a kind of internetware main body system under dynamic interaction network environment trust negotiation constructing method according to claim 1, it is characterized in that: the success or not of two main bodys of cooperation relation of breaking the wall of mistrust is relevant with the compatible degree size, compatible degree is defined as the cooperation degree sum of main body i degree of belief and j, i.e. compatible degree f (t)=p
i* m*T
i(t)+p
j' * n*C
j(t); Whether trusting relationship is successfully by relatively determining with the compatible degree reference value between the software agent.
6. a kind of according to claim 1 or 5 internetware main body system under dynamic interaction network environment trust negotiation constructing method, it is characterized in that: the foundation of trusting relationship need be relevant with reference value between the software agent, this reference value is the compatible degree reference value, this reference value is the compatible degree size of calculating when main bodys have average trust information in the system, the relation of breaking the wall of mistrust when greater than this reference value, and choosing of this reference value meets human cooperation group psychology in the social psychology.
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|---|---|---|---|---|
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| CN102801524A (en) * | 2012-06-13 | 2012-11-28 | 天津大学 | Trust-theory-based trusted service system based on trusted authentication system |
| CN102801524B (en) * | 2012-06-13 | 2015-01-21 | 天津大学 | Trust-theory-based trusted service system based on trusted authentication system |
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