Mecanismos de segurança para um sistema cooperativo de armazenamento de arquivos baseado em P2P

Previous works have studied the characteristics and peculiarities of P2P networks, especially security information aspects. Most works, in some way, deal with the sharing of resources and, in particular, the storage of files. This work complements previous studies and adds new definitions relating to this kind of systems. A system for safe storage of files (SAS-P2P) was specified and built, based on P2P technology, using the JXTA platform. This system uses standard X.509 and PKCS # 12 digital certificates, issued and managed by a public key infrastructure, which was also specified and developed based on P2P technology (PKIX-P2P). The information is stored in a special file with XML format which is especially prepared, facilitating handling and interoperability among applications. The intention of developing the SAS-P2P system was to offer a complementary service for Giga Natal network users, through which the participants in this network can collaboratively build a shared storage area, with important security features such as availability, confidentiality, authenticity and fault tolerance. Besides the specification, development of prototypes and testing of the SAS-P2P system, tests of the PKIX-P2P Manager module were also performed, in order to determine its fault tolerance and the effective calculation of the reputation of the certifying authorities participating in the system

Um serviço de certificação digital para plataformas de middleware

Nowadays due to the security vulnerability of distributed systems, it is needed mechanisms to guarantee the security requirements of distributed objects communications. Middleware Platforms component integration platforms provide security functions that typically offer services for auditing, for guarantee messages protection, authentication, and access control. In order to support these functions, middleware platforms use digital certificates that are provided and managed by external entities. However, most middleware platforms do not define requirements to get, to maintain, to validate and to delegate digital certificates. In addition, most digital certification systems use X.509 certificates that are complex and have a lot of attributes. In order to address these problems, this work proposes a digital certification generic service for middleware platforms. This service provides flexibility via the joint use of public key certificates, to implement the authentication function, and attributes certificates to the authorization function. It also supports delegation. Certificate based access control is transparent for objects. The proposed service defines the digital certificate format, the store and retrieval system, certificate validation and support for delegation. In order to validate the proposed architecture, this work presents the implementation of the digital certification service for the CORBA middleware platform and a case study that illustrates the service functionalities

O Programa Nacional Biblioteca da Escola - PNBE: da gestão ao leitor na educação infantil de Natal-RN

This study aims to investigate the process of implementation of Programa Nacional Biblioteca da Escola, PNBE, and the reader's training on Childhood Education level in Natal. The promotion of literary reading is the opportunity of inclusion in a world that is connected to citizenship, to human rights and social justice, because the reading is the way which gives meaning to the life and, therefore, it is a right for everybody. The study is characterized as a qualitative research with evaluative approach. The methodological procedure that constitutes this corpus took place in three stages: the first one was about the analysis of laws and documents of national public policies for the reading promotion; questionnaires were applied by Managing Committee - Natal/RN to CMEIs and the available websites from MEC that provide distribution of the acquis; in the second stage, we adopted the semi-structured interview as a methodological procedure elaborated with open questions that focus on the program management and to the acquis of PNBE; and in the third step we visited the 21 centers of childhood education in Natal for interviewing and to do the exploratory observation in places of reading. The Informant actors in this research are: the advisors of SME - Natal and FNDE, managers and teachers in Municipal Childhood Education Centers who totalize 30 informants. This theoretical and methodological framework follows the studies of Amarilha (1993; 1994; 2002; 2006; 2010; 2012), Bardin (2001), Bogdan; Biklen (1994), Castro (2007; 2008; 2012), Demo (2000; 2006; 2008), Fischer (2006), Moreira; Caleffe (2008), Paiva (2008; 2012), Secchi (2010; 2012), Soares (2003; 2008) and Zilberman (2001; 2003; 2008). The analysis indicates that decentralization strategy which is adopted in public management model will transfer responsibilities and assumption of the PNBE, exempting the actors to planning actions ensuring the efficiency and efficacy implementation on reading policy to national and municipal levels. The qualified acquis that is distributed by MEC reaches every Childhood Education center and does not depend on teacher's desire or it action, only a few of them know about it and they do not have information about the PNBE, neither receive specific training in order to articulate it to the practice of reading with children from Childhood Education. The reading project implemented by private education system in Natal overlaps the PNBE, making it invisible. The reading places that are available for that schooling stage are summarized to the reading corners. In some CMEI, books remain stored in boxes or they are locked in the closet, out of use to the teachers and students. Thus, care for the acquisition, selecting acquis, and a preoccupation to the supply of the reading and books for this education level are lost into volumes of closed boxes, teachers are jettisoned to this process and children do not have any enchantment to the reading or books. In this context, this paper draws attention to how much we should still investigate in order to understanding the perspectives, stresses and challenges from public policies for the reading promotion in our country. We hope that the research will help to improve the management model of the PNBE, ensuring the reading democratization and therefore the reader's training in early Childhood Education.

O Programa Nacional Biblioteca da Escola - PNBE: da gestão ao leitor na educação infantil de Natal-RN

This study aims to investigate the process of implementation of Programa Nacional Biblioteca da Escola, PNBE, and the reader's training on Childhood Education level in Natal. The promotion of literary reading is the opportunity of inclusion in a world that is connected to citizenship, to human rights and social justice, because the reading is the way which gives meaning to the life and, therefore, it is a right for everybody. The study is characterized as a qualitative research with evaluative approach. The methodological procedure that constitutes this corpus took place in three stages: the first one was about the analysis of laws and documents of national public policies for the reading promotion; questionnaires were applied by Managing Committee - Natal/RN to CMEIs and the available websites from MEC that provide distribution of the acquis; in the second stage, we adopted the semi-structured interview as a methodological procedure elaborated with open questions that focus on the program management and to the acquis of PNBE; and in the third step we visited the 21 centers of childhood education in Natal for interviewing and to do the exploratory observation in places of reading. The Informant actors in this research are: the advisors of SME - Natal and FNDE, managers and teachers in Municipal Childhood Education Centers who totalize 30 informants. This theoretical and methodological framework follows the studies of Amarilha (1993; 1994; 2002; 2006; 2010; 2012), Bardin (2001), Bogdan; Biklen (1994), Castro (2007; 2008; 2012), Demo (2000; 2006; 2008), Fischer (2006), Moreira; Caleffe (2008), Paiva (2008; 2012), Secchi (2010; 2012), Soares (2003; 2008) and Zilberman (2001; 2003; 2008). The analysis indicates that decentralization strategy which is adopted in public management model will transfer responsibilities and assumption of the PNBE, exempting the actors to planning actions ensuring the efficiency and efficacy implementation on reading policy to national and municipal levels. The qualified acquis that is distributed by MEC reaches every Childhood Education center and does not depend on teacher's desire or it action, only a few of them know about it and they do not have information about the PNBE, neither receive specific training in order to articulate it to the practice of reading with children from Childhood Education. The reading project implemented by private education system in Natal overlaps the PNBE, making it invisible. The reading places that are available for that schooling stage are summarized to the reading corners. In some CMEI, books remain stored in boxes or they are locked in the closet, out of use to the teachers and students. Thus, care for the acquisition, selecting acquis, and a preoccupation to the supply of the reading and books for this education level are lost into volumes of closed boxes, teachers are jettisoned to this process and children do not have any enchantment to the reading or books. In this context, this paper draws attention to how much we should still investigate in order to understanding the perspectives, stresses and challenges from public policies for the reading promotion in our country. We hope that the research will help to improve the management model of the PNBE, ensuring the reading democratization and therefore the reader's training in early Childhood Education.