The discrete cosine transform (DCT), introduced by Ahmed, Natarajan and Rao, has been used in many applications of digital signal processing, data compression and information hiding. There are four types of the discrete cosine transform. In simulating the discrete cosine transform, we propose a generalized discrete cosine transform with three parameters, and prove its orthogonality for some new cases. A new type of discrete cosine transform is proposed and its orthogonality is proved. Finally, we propose a generalized discrete W transform with three parameters, and prove its orthogonality for some new cases. Keywords: Discrete Fourier transform, discrete sine transform, discrete cosine transform, discrete W transform Nigerian Journal of Technological Research , vol7(1) 2012

On discrete cosine transform

Implementasi dan analisis video watermarking dengan format video avi berbasis lsb (least significant bit) dan ssb-4 (system of steganography using bit 4)

The objectives of this study were verify in what measure the small and medium companies accomplish the management security information and identify which factors influence the small and medium companies to adopt measures of management security information. The source research was exploratory-descriptive and the design used was the survey. The sample was compound of 43 metal production industries located in ABC region. According to management information security literature and Brazilian norm of information security were identified the tools or techniques of management security information and classified it into three layers: physic, logic and human. The study identified that the human layer is the one that presents the major shortage of cares in the companies followed by the logical one. The companies get used to have the antivirus as the main security tool/technique according to the researched companies to guarantee the safety of information. Besides that, the research showed that 59% of the companies have a safety satisfactory level and the main motivator factor to adopt the management security information is "to avoid possible financial loss”. On the other hand, all the inhibitors factors showed important to the researched companies like: lack of knowledge, investments value, organization culture and difficulty to measure cost/benefit.

Gestão da segurança da informação: fatores que influenciam sua adoção em pequenas e médias empresas information security management: factors that influence its adoption in small and mid-sized businesses

Prediction of steganography in images using a mathematical model

In contemporary Russia the significant inequality in municipalities’ living standards is caused by differentiation in their socio-economic development The breakthrough in economy and social sector could improve both the living standards and the demographic environment This paper attempts to determine the correlation of “smart city” digitization process and the living standards in municipal districts of Samara oblast A combination of descriptive, multidimensional and distribution-free methods was used in the data analysis The aggregated index for living standards of the municipal districts was calculated The framework for the “smart city” digital platform was described Statistically significant correlation between “smart city” digitization process and living standards determinants was ascertained

Smart City and Living Standards: Significant Correlation

Sensitive information being shared on the internet is growing. Because of this, it is increasingly necessary to take security measures whilst this information travels in the network. Digital steganography allows one to send sensitive information in a hidden manner. Although there is a plethora of techniques for such a goal, finding an appropriate one is not always simple. This paper implements and compares spatial-domain digital steganography techniques in both RGB and grayscale images. A frequency-domain heuristic for reducing the visual impact of digital steganography in grayscale images is presented. As another result of this work, a dataset is also available in the Kaggle platform with 18 GB of images, containing secret messages using the techniques under study. In addition, a Python language library was also made available in the PyPI repository, allowing for both concealment and revelation of messages using the presented digital steganography methods.

/pdf/analise-comparativa-de-metodos-para-esteganografia-digital-14jv7uavm7.pdf

Análise Comparativa de Métodos para Esteganografia Digital em Imagens

In recent years, the search to make cities smart often has been a strategy designed to mitigate problems generated by urban population growth. To improve the population's quality of life and optimize the use of resources and infrastructure, applications in various fields have been developed. Public bus services are widely deployed in cities around the world because they provide cost-effective public transportation. Most of the time the citizens are not provided information about the buses in real-time (location, route, etc). This paper address this lack of information on public bus services and presents ShareBus, an information system to improve urban mobility. The system architecture and its main functionalities are described. A preliminary implementation of the system is also presented which is evaluated through real tests. The system uses the idea of collaboration to obtain and maintain data, either from users or companies, keeping it as much as possible updated.

Diego H. B. Zanchett

Papers

Análise Comparativa de Métodos para Esteganografia Digital em Imagens

Collaborative information system to find efficient routes using public transport