Digital Signatures
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Consulta a base de dados cifrada em computação nas nuvens
With the dissemination and popularization of the Internet, more and more people and businesses are using cloud computing services. Among these services, there is a storage and hosting of databases in the clouds. In this context a problem arises, how to ensure the privacy and integrity of databases that are exposed to attacks. The goal of this dissertation is
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/08/2011
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2. A proposal for regulation of digital certification in Brazil / Um proposta para a regulamentação da certificação digital no Brasil
This work examined the regulation of ICP-Brazil, aiming to verify whether the digitally signed documents within this infrastructure, have the technical characteristics necessary and sufficient to be useful, indeed, as legal evidence, even for long term. We analyzed international standards for digital certification and digital signature and the legislation of
Publicado em: 2009
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3. DHA :um esquema de acordo de chaves baseado em matrizes para o protocolo Diffie-Hellman
In this work is proposed an annonimous cryptographic key agreement protocol by secure way based on Diffe-Hellman protocol. Actually key agreement protocols like Diffe-Hellman, ElGamal and other work with modular exponentiation operations and the complexity of such protocols are based on apparent diffcult to deal DLP (Discrete Logarithm Problems). The propose
Publicado em: 2007
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4. USO DE TÉCNICAS DE SENSORIAMENTO REMOTO E SIG PARA MAPEAMENTO DOS ALUVIÕES EM ZONAS SEMI-ÁRIDAS ATRAVÉS DE MÉTODOS DE CLASSIFICAÇÃO AUTOMÁTICA / USE OF REMOTE SENSING AND GIS FOR ALUVIUM MAPPING IN SEMI-ARID REGIONS THROUGH AUTOMATIC CLASSICATION
Remote sensing has being widely applied in various fields of knowledge in order to produce high quality results with lower costs, computationally and financially speaking. The main goal of this research is the use remote sensing techniques combined with field surveys for the semi-automatic identification of alluvium bodies. The proposed methodology was based
Publicado em: 2006
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5. A assinatura eletrônica como requisito de validade dos negócios jurídicos e a inclusão digital na sociedade brasileira / An electronic signature as a requirement for validating legal business and the digital inclusion in Brazilian society
New technologies have promoted the creation of various business modalities, focuses of discussion and formalizations in the way of electronic contracts, involving companies and citizens using digital means. Electronic transaction can be protected by digital signatures, implemented by digital certification. This procedure is not totally supported by Brazilian
Publicado em: 2005
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6. Characterization of vegetation physiognomies in earstern Amazonon region through airbone videography and landsat 7 ETM + images / Caracterização de fisionomias vegetais na Amazônia Oriental através de videografia aerotransportada e imagens landsat 7 ETM+
Transformation of multispectral remote sensing data is needed for compression of data volume and for the inference of biophysical properties of the land cover. Linear Spectral Mixing Models (LSMM) and Normalized Difference Vegetation Index (NDVI) are transformations that result in indicators of vegetation structure. However these methods present limitations
Publicado em: 2003
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7. Análise temporal com sensor orbital de unidades fisionômicas de cerrado na gleba Pé-de-Gigante (Parque Estadual de Vassununga - SP). / Temporal analysis of physiognomic unit of cerrado vegetation with orbital sensor at Pé-de-Gigante (State Park of Vassununga - SP).
The main goal of this dissertation is to calibrate the cerrado vegetation physiognomies (Brazilian savannas) with their seasonal spectral signatures to help the monitoring and the conservation of their remnants. The study area is the cerrado Pé-de- Gigante (belonging to State Park of Vassununga in Santa Rita do Passa Quatro -SP). Using NDVI images derived f
Publicado em: 1998
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8. The Use of Simulated Annealing in Chromosome Reconstruction Experiments Based on Binary Scoring
We present a method of combinatorial optimization, simulated annealing, to order clones in a library with respect to their position along a chromosome. This ordering method relies on scoring each clone for the presence or absence of specific target sequences, thereby assigning a digital signature to each clone. Specifically, we consider the hybridization of
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9. Application of Digital Image Analysis and Flow Cytometry To Enumerate Marine Viruses Stained with SYBR Gold†
A novel nucleic acid stain, SYBR Gold, was used to stain marine viral particles in various types of samples. Viral particles stained with SYBR Gold yielded bright and stable fluorescent signals that could be detected by a cooled charge-coupled device camera or by flow cytometry. The fluorescent signal strength of SYBR Gold-stained viruses was about twice tha
American Society for Microbiology.