Information flow control in object-based peer-to-peer publish/subscribe systems

摘要

In this paper, we propose a P2PPSO (P2P [peer-to-peer] type of topic-based Publish/Subscribe with Object concept) model, where each peer process (peer) exchanges objects by publishing and receiving event messages with no centralized coordinator. In addition, objects are characterized by topics. Suppose an event message e(j) published by a peer p(j) carries an object on some topics into a target peer p(i). Here, information in the peer p(j) illegally flows to the peer p(i) if the target peer p(i) is not allowed to subscribe the topics. An illegal object is an object whose topics a target peer is not allowed to subscribe. Even if an event message is received by a target peer by checking topics, objects carried by the event message may be illegal at the target peer. In this paper, we propose a TOBS (topics-of-objects-based synchronization) protocol to prevent target peers from receiving illegal objects in the P2PPSO model. Here, even if an event message is received by a target peer, illegal objects in the event message are not delivered to the target peer. In the evaluation, we show how many event messages carry illegal objects in the TOBS protocol.