Fábio Buiati

Hierarchical Neighbor Discovery Scheme for Handover Optimization

In the future mobile Internet, one of the most challenging aspects is to discover the available neighbor access networks and its characteristics as the user moves. Using the IEEE 802.21 Media Independent Handover (MIH) standard, this letter proposes a new neighbor network discovery mechanism, considering a hierarchical view of the network information. Through a NS-2 based simulation, it is shown that the proposed model can significantly improve the mobility user experience.

A Secure Autoconfiguration Protocol for MANET Nodes

In this paper we propose a secure autoconfiguration model for Manet. Our design is based in a distributed and self-organization certification service, which provides node identification and authentication for the autoconfiguration protocol. We have defined some modifications in the Dynamic Configuration and Distribution Protocol (DCDP) in order to extend the protocol functionalities to include security-aware node identification and authentication services. The overall security is also enforced with intrusion detection techniques.

Design and Evaluation of a Services Interface for the Internet of Things

This paper proposes an application programming interface (API) for accessing services within the internet of things (IoT) through both REST and SOAP protocols. This API provides methods and procedures to allow its usage for performing IoT control and event monitoring operations. In order to encompass devices diversity, the proposed API introduces a uniform abstraction model that constitutes a common standard view to manage objects. An abstract device services interface is then available instead of device commands, thus providing transparent access to devices capabilities and hiding the physical aspects of provider devices. The API has been designed to ease the remote management of IoT smart objects and was implemented as a module of an existing IoT middleware (UIoT). Experimental evaluation of both protocol implementations yields results showing the REST services with faster response time and lower resources usage than similar SOAP services.

Authentication and Autoconfiguration for MANET Nodes

In this paper we propose a secure autoconfiguration model for Manet. Our design is based in a distributed and self-organization certification service, which provides node identification and authentication for the autoconfiguration protocol. We have defined some modifications in the Dynamic Configuration and Distribution Protocol (DCDP) in order to extend the protocol functionalities to include security-aware node identification and authentication services. The overall security is also enforced with intrusion detection techniques.

A Zone-Based Media Independent Information Service for IEEE 802.21 Networks

Next generation networks integrate different wireless technologies, including Wi-Fi, Wi-Max, and 3GPP (UMTS, HSPA, and/or LTE), in which the mobile node (MN) has the opportunity to switch from one network to another, under an always best connected scheme. In such heterogeneous environment, discovering which types of network connectivity and services are available is a critical challenge. The IEEE 802.21 standard specifies a network information server entity providing network information within a geographical area by which the MN can discover a service or a network. In this paper, we propose a zone-based media independent information service using the IEEE 802.21 standard to accelerate the neighbor discovery procedure. In the proposed scheme, the access networks are associated and grouped in mobility zones, through an efficient set of rules, to minimize the amount of control messages flowing in the core network. Through a NS-2 based simulation, the results demonstrate that the proposed scheme reduces the neighbor discovery delay as well as the signaling overhead if compared with the standard MIIS deployment.

A layered trust information security architecture

Information can be considered the most important asset of any modern organization. Securing this information involves preserving confidentially, integrity and availability, the well-known CIA triad. In addition, information security is a risk management job; the task is to manage the inherent risks of information disclosure. Current information security platforms do not deal with the different facets of information technology. This paper presents a layered trust information security architecture (TISA) and its creation was motivated by the need to consider information and security from different points of view in order to protect it. This paper also extends and discusses security information extensions as a way of helping the CIA triad. Furthermore, this paper suggests information representation and treatment elements, operations and support components that can be integrated to show the various risk sources when dealing with both information and security. An overview of how information is represented and treated nowadays in the technological environment is shown, and the reason why it is so difficult to guarantee security in all aspects of the information pathway is discussed.

Self-configuration and self-optimization process in heterogeneous wireless networks.

Self-organization in Wireless Mesh Networks (WMN) is an emergent research area, which is becoming important due to the increasing number of nodes in a network. Consequently, the manual configuration of nodes is either impossible or highly costly. So it is desirable for the nodes to be able to configure themselves. In this paper, we propose an alternative architecture for self-organization of WMN based on Optimized Link State Routing Protocol (OLSR) and the ad hoc on demand distance vector (AODV) routing protocols as well as using the technology of software agents. We argue that the proposed self-optimization and self-configuration modules increase the throughput of network, reduces delay transmission and network load, decreases the traffic of HELLO messages according to network’s scalability. By simulation analysis, we conclude that the self-optimization and self-configuration mechanisms can significantly improve the performance of OLSR and AODV protocols in comparison to the baseline protocols analyzed.

Design and evaluation of a decentralised information service architecture for IEEE 802.21 networks

The deployment of wireless technologies such as Wi-Fi, WIMAX and LTE brings to the mobile user the opportunity to switch from one network to another, in a seamless manner. To accomplish this, the user must be able to discover which types of network connectivity are available. The IEEE 802.21 standard specifies a media independent information service MIIS providing capabilities for discovering network information within a geographical area. The representation and distribution of mobility information in heterogeneous networks are a big challenge, especially in multi-operator environments. In this paper, we introduce a decentralised information service architecture that improves the user experience and ensures scalability for large system deployments. Additionally, an evaluation using the NS-2 network simulator is presented. The results demonstrate that our proposal outperforms the existing approaches in terms of query delay, users optimal handovers and communication overhead, contributing to a traffic decrease at the operators core network and internet.

Secure data storage in distributed cloud environments

In order to prevent the attack and discovery of sensitive data, a model is presented to protect the confidentiality of data even when the attackers have access to all data from the server: using systems that perform queries and inserts on encrypted data without the decryption key. The model set is applied in a real scenario: a distributed system hosted by Google (Encrypted BigQuery), which includes the use of encryption in data stored in non-relational databases for massive data processing. As a result, it is shown that this system supports a variety of applications with low overhead.

Dynamic IEEE 802.21 information server mesh architecture for heterogeneous networks

The future wireless communications is expected to integrate different link layer technologies and to allow the most appropriate network to be selected depending on different criteria. Mobile nodes MN may want to discover neighbouring networks and detailed parameters before it moves into the coverage areas of the candidate networks, focusing on the optimisation of handover processes. In the IEEE 802.21 standard, a media independent information service MIIS is developed providing network information within a geographical area. However, the MIIS focuses on the static information channel information, service provider name, network type supported, etc.. Dynamic information includes link-layer parameters such as available network resources, throughput, data rate, etc. This paper proposes a dynamic information server mesh architecture DISMA for realtime collection, discovery and sharing of dynamic network information. With DISMA, the MN is able to retrieve real-time dynamic information using a decentralised MIIS framework. Finally, this distributed approach generates an important advantage regarding the scalability and robustness if compared with the traditional centralised scheme. This paper also provides NS-2 simulation results and analytical models to prove the feasibility and performance of DISMA scheme.