Abstract. We propose a novel block-based symmetric encryption system based on an n-array of independently iterated chaotic logistic maps with global and local feedback as a diffusion process. Local feedback represents the temporal evolution of a single map, while global feedback represents the temporal evolution of the whole system (cross-map evolution). For security, the cryptosystem periodically modifies its internal configuration using a three-level random perturbation scheme, one at system-key (reset operation) and two at map array level (to increase the chaotic cycle length of the system). An analysis of the proposed scheme regarding its vulnerability to attacks, statistical properties and implementation performance is presented. To the best of our knowledge we provide a simple and secure scheme with the fastest software implementation reported in the literature.
We developed an IP mapping tool called VisRutas for discovering connection and geographic location of routers (hosts) in the public Internet. Unlike previous schemes that use large data bases and intensive route probe systems (as the Rocketfuel method) or less reliable IP-to-location mapping list (GeoTrack and GeoCluster methods), our approach is simple, fast and effective. It is based on small database tables, scalable traceroute and tracert based route information, BorderGateway Protocol (BGP) tables and a reliable IP to location mapping list.VisRutas tool was applied to estimate the router-level topology (connection) map of the public Internet in México, and the complete analysis took minutes to hours, whereas previous schemes take days to weeks. It is fair to mention that the other schemes provide better detail mapping inside the Internet Service Provider's domain, (which is not our main objective). Another advantage of our approach (VisRutas) is that it can be successfully applied anywhere in the world (as long as we input the correct end-nodes probing list), as well as to make early path diversity discovery to improve media delivery architecture design.
We propose a new collaborative clock offset estimation scheme between two nodes in the Internet using independent one-way offset estimations. Our proposal (different than current schemes in the literature) is intended to provide a fast and accurate clock offset estimation in approximately [Round-Trip Time (RTT)+40]ms. The scheme sends a group of 5 probes in the the forward and reverse paths, and models the One-way Transit Time (OTT) by a Gamma distribution (with parameters adapted to actual path condition) to estimate the minimum distribution value (or long-term minimum OTT value). End nodes exchange their corresponding minimum distribution values to get an improved final clock offset estimate, which takes into account the network path asymmetries. We show that our scheme provides a faster clock offset estimation with lower RMSE and superior stability than NTP and current NTP-like state of the art methodologies in the literature.
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