Method for supervising the security of an architecture comprising a plurality of interconnected clouds , a cloud comprising a plurality of resources and a security supervisor (SS 101 , SS 102 , SS 103 ), said supervisor being able to drive a set of security controllers (CS11, CS12) of a cloud, the plurality of resources forming a plurality of resource groups in the cloud that are respectively associated with a security domain (ds11, ds12, etc.), a security controller (CS11, CS12, etc.) supervising the resources of the domain, a plurality of physical machines comprising the resources of the plurality of clouds, the security supervisors of the respective clouds comprising a set of security rules forming a security policy, the method comprising: - a step (E22) of reception of a security event by a security controller (CS11) of a first cloud , originating from a first resource (r13) associated with a first security domain (ds11), - a step (E24) of sending of said security event to the security supervisor (SS101) of the first cloud, - a step (E27) of sending of a security order by the security supervisor of the first cloud (SS 101 ) to at least a second security controller of the first cloud in reaction to the security event, and of sending of the security order by the second security controller to a second resource supervised by the second controller, - a step (E28) of sending by the supervisor of the first cloud to the other supervisors of clouds, of information relating to the security event, - a step (E29) of negotiation between the first supervisor and the other supervisors of the other clouds, in the course of which a second security order is determined as a function of the information relating to the security event which occurred in the first cloud, if appropriate of at least one security order which has been applied, and respective security policies of the other security supervisors, - a step (E30) of sending by at least one of the other supervisors to at least one third resource of the second security order, the third resource being included in a different cloud from the first cloud, said other supervisor supervising said different cloud from the first cloud. - a step (E22) of reception of a security event by a security controller (CS11) of a first cloud , originating from a first resource (r13) associated with a first security domain (ds11), - a step (E24) of sending of said security event to the security supervisor (SS101) of the first cloud, - a step (E27) of sending of a security order by the security supervisor of the first cloud (SS 101 ) to at least a second security controller of the first cloud in reaction to the security event, and of sending of the security order by the second security controller to a second resource supervised by the second controller, - a step (E28) of sending by the supervisor of the first cloud to the other supervisors of clouds, of information relating to the security event, - a step (E29) of negotiation between the first supervisor and the other supervisors of the other clouds, in the course of which a second security order is determined as a function of the information relating to the security event which occurred in the first cloud, if appropriate of at least one security order which has been applied, and respective security policies of the other security supervisors, - a step (E30) of sending by at least one of the other supervisors to at least one third resource of the second security order, the third resource being included in a different cloud from the first cloud, said other supervisor supervising said different cloud from the first cloud. <EOS>