Hamza Baqa, Nguyen B. Truong, Noël Crespi, Gyu Myoung Lee · 5 authors
The emerging Blockchain (BC) and Distributed Ledger technologies have come to impact a variety of domains, from capital market sectors to digital asset management in the Internet of Things (IoT). As a result, more and more BC-based decentralized applications for numerous cross-domain services have been developed. These applications implement specialized decentralized computer programs called Smart Contracts (SCs) which are deployed into BC frameworks. Although these SCs are open ato public, it is challenging to discover and utilize such SCs for a wide range of usages from both systems and end-users because such SCs are already compiled in form of byte-codes without any associated meta-data. This motivates us to propose a solution called Semantic SC (SSC) which integrates RESTful semantic web technologies in SCs, deployed on the Ethereum Blockchain platform, for indexing, browsing and annotating such SCs. The solution also exposes the relevant distributed ledgers as Linked Data for enhancing the discovery capability. To achieve this goal, the OWL-S service ontology is extended by incorporating some domain specific terminologies, which are used in the development of the proposed SSCs. As a result, SSC can be utilized to enrich queries for a domain-specific terms across multiple distributed ledgers, which greatly increases the discovery capability of decentralized IoT applications and services. Contribution in standardization is also discussed. We believe that our research work takes the first steps towards connecting BC-based decentralized services with semantic web services in order to provide better IoT ecosystems.
The blockchain is a distributed technology which allows establishing trust among unreliable users who interact and perform transactions with each other. While blockchain technology has been mainly used for crypto-currency, it has emerged as an enabling technology for establishing trust in the realm of the Internet of Things (IoT). Nevertheless, a naive usage of the blockchain for IoT leads to high delays and extensive computational power. In this paper, we propose a blockchain architecture dedicated to being used in a supply chain which comprises different distributed IoT entities. We propose a lightweight consensus for this architecture, called LC4IoT. The consensus is evaluated through extensive simulations. The results show that the proposed consensus uses low computational power, storage capability and latency.
Open access
2 source records
Blockchain Technology Applications and Security
IoT and Edge/Fog Computing
Advanced Steganography and Watermarking Techniques
Based on daily data about Bitcoin and six other major financial assets (stocks, commodity futures (commodities), gold, foreign exchange (FX), monetary assets, and bonds) in China from 2013 to 2017, we use a VAR-GARCH-BEKK model to investigate mean and volatility spillover effects between Bitcoin and other major assets and explore whether Bitcoin can be used either as a hedging asset or a safe haven. Our empirical results show that (i) only the monetary market, i.e., the Shanghai Interbank Offered Rate (SHIIBOR) has a mean spillover effect on Bitcoin and (ii) gold, monetary, and bond markets have volatility spillover effects on Bitcoin, while Bitcoin has a volatility spillover effect only on the gold market. We further find that Bitcoin can be hedged against stocks, bonds and SHIBOR and is a safe haven when extreme price changes occur in the monetary market. Our findings provide useful information for investors and portfolio risk managers who have invested or hedged with Bitcoin.
Ankit Gangwal, Samuele Giuliano Piazzetta, Gianluca Lain, Mauro Conti
Cybercriminals have been exploiting cryptocurrencies to commit various unique financial frauds. Covert cryptomining - which is defined as an unauthorized harnessing of victims' computational resources to mine cryptocurrencies - is one of the prevalent ways nowadays used by cybercriminals to earn financial benefits. Such exploitation of resources causes financial losses to the victims. In this paper, we present our novel and efficient approach to detect covert cryptomining. Our solution is a generic solution that, unlike currently available solutions to detect covert cryptomining, is not tailored to a specific cryptocurrency or a particular form of cryptomining. In particular, we focus on the core mining algorithms and utilize Hardware Performance Counters (HPC) to create clean signatures that grasp the execution pattern of these algorithms on a processor. We built a complete implementation of our solution employing advanced machine learning techniques. We evaluated our methodology on two different processors through an exhaustive set of experiments. In our experiments, we considered all the cryptocurrencies mined by the top-10 mining pools, which collectively represent the largest share (84% during Q3 2018) of the cryptomining market. Our results show that our classifier can achieve a near-perfect classification with samples of length as low as five seconds. Due to its robust and practical design, our solution can even adapt to zero-day cryptocurrencies. Finally, we believe our solution is scalable and can be deployed to tackle the uprising problem of covert cryptomining.
The purposes of the study are threefold: (1) develop key successful factors of blockchain platform for micro-enterprises based on Balanced Scorecard (BSC), (2) find out the correlation between the key successful factors of blockchain platform for micro-enterprises, and (3) understand the perception of micro-enterprise blockchain and the difference between theoretical guidance and practical application. This study combines Interpretative Structural Modeling Method, (ISM) and Decision-Making Trial and Evaluation Laboratory (DEMATEL) to analyze the causal relationships and hierarchical structures of the 12 key successful factors of blockchain platform for micro-enterprises and understand the correlation between factors. The 12 key successful factors developed based on the four perspectives of the Balanced Scorecard, and the questionnaire designs based on the concept of DEMATEL, and then analyzed data by DEMATEL and ISM methods to understand the correlation between key factors. The research results show that the key successful factors of blockchain platform for micro-enterprises include "brand equity", "security and anti-counterfeiting", "sales growth", "transparency and clear", "trust", "consensus mechanism", "traceability", "consistency", "tracking", "innovation management", "international", "organizational adaptation", in which consumer "trust" plays an important role. Micro-enterprises can use blockchain to expand the market, provide customers with better service quality, and bring sales growth to micro-enterprises.
It started in June, with cardiovascular disease. Then August ended with another bout, but in cancer. It's been a rough… The post A Double Whammy of Non-Good News About Non-Inferiority Trials appeared first on Absolutely Maybe.
Increased penetration of Renewable Energy Sources(RES) and ever expanding global energy demands push forward the need of efficient utilization of RES by incorporating the prosumers (who are able to inject produced renewable energy) into the energy infrastructure.Moreover, there is emerging demand of the prosumers to participate in the electricity market and monetise their contributions.In order to facilitate these demands, the traditional centralised architectures are no longer viable therefore a decentralised transactive energy system enabling peer to peer energy trading, should be adopted.In this context, Blockchain based decentralised ledger technology emerges as the most viable solution which offers peer to peer energy trading platform providing a unique distributed local energy market model(LEM) for beneficial energy exchanges among participants which represents evolution for future smart grids.This thesis provides comprehensive review of the fundamental characteristics of the blockchain technology and its promising solutions for the energy industry.P2P energy trading, one of the use case of blockchain in energy sector has been focused and explored by thoroughly reviewing various initiatives, research and pilot projects that are currently working in that area.Moreover potential challenges pertaining to this blockchain based application are also evaluated.Based on the extensive research and literature review, a simple model of blockchain based peer to peer energy trade using IoT devices has been developed.Hence, this thesis provides all the necessary technical details and steps required to build the simple model of blockchain application for energy transactions.
In recent years, multi-party computation (MPC) frameworks based on replicated secret sharing schemes (RSSS) have attracted the attention as a method to achieve high efficiency among known MPCs. However, the RSSS-based MPCs are still inefficient for several heavy computations like algebraic operations, as they require a large amount and number of communication proportional to the number of multiplications in the operations (which is not the case with other secret sharing-based MPCs). In this paper, we propose RSSS-based three-party computation protocols for modular exponentiation, which is one of the most popular algebraic operations, on the case where the base is public and the exponent is private. Our proposed schemes are simple and efficient in both of the asymptotic and practical sense. On the asymptotic efficiency, the proposed schemes require O(n)-bit communication and O(1) rounds,where n is the secret-value size, in the best setting, whereas the previous scheme requires O(n2)-bit communication and O(n) rounds. On the practical efficiency, we show the performance of our protocol by experiments on the scenario for distributed signatures, which is useful for secure key management on the distributed environment (e.g., distributed ledgers). As one of the cases, our implementation performs a modular exponentiation on a 3,072-bit discrete-log group and 256-bit exponent with roughly 300ms, which is an acceptable parameter for 128-bit security, even in the WAN setting.
For the last two decades, we have witnessed major changes in technological advances. Most if not all individuals worldwide use technological tools to ease their lives. Mobile devices and computers are being used daily and through such devices, one can perform its investment or banking activities arround the clock. The purpose of this paper is to assess whether cryptocurrencies will have a future in emerging markets and especially in Mauritius. Mauritius is an island situated in the Indian Ocean and has a population of approximately one million two hundred citizens and ninety-one as at January 2019. The aim of the study is to investigate the factors that could lead to the adoption of cryptocurrencies in Mauritius. An online questionnaire was prepared and sent to 100 respondents and 71 were deemed as valid for the analysis. Our empirical findings showed that students and employed individuals could be the potential users of cryptocurrencies. Undoubtedly, the use of cryptocurrencies is strongly influenced by the regulations to be put in place. Recommendations have been made in view to assess the possible future of cryptocurrency in Mauritius.
Blockchain refers to a distributed ledger technology that represents an innovation in recording and sharing information without the need for a trusted third party. Blockchain technology offers new tools for security and privacy concerns. Marching towards digitization and analytics, this technology emerges as a promising solution for authentication and authorization issues. It sounds so amazing that this technology that originated with cryptocurrencies could not only be applied in digital contracts, financial and public records, and property ownership but also in medicine, education, science and so on. The use case of this technology springs up in every possible direction. This article first analyses the need for this breakthrough technology and explains how this technology works. This work presents a review on various types of blockchain, the consensus mechanisms used, their advantages and limitations. It provides an overview on the various use cases of this technology. This work mainly focuses on its application in Healthcare. The goal of this article is to analyze the usage of Blockchain technology in various fields of Healthcare such as Electronic Health Record, Health Insurance, Biomedical Research, Drug Supply, Medical Education, Remote Patient Monitoring, Interoperability, Location Sharing etc., It investigates the current research trends and finds the gaps and limitations of these approaches. Moreover, it proposes some enhancements to fill in the gaps in the present approach. This work also analyses the importance of Wearable Internet of Things (IoT) devices in HealthCare and the integration of these devices with Blockchain. Finally, this work concludes by comparing Blockchain 3.0 with previous versions.
Today the emerging trend and innovative technology is block chain technology. The actual question is how to manage this. The basic concept behind this is mining. Block chain is equal to governance. It is basic type of governance. It governs a book called ledger which contains information. Here we focus on double spend attack in block chain. The attackers has a space to block the new transactions from gaining access to acknowledgements. They make half payments between some or all users. It is even possible to reverse transactions when using the network or holding the complete control of the network thus spending the coins twice which means double spend coins. This attack always exist as a thread and users are panic about their transactions being used by a corrupted miner. The solution for this malicious mining is Proof of Work (PoW) which is proved to be not sufficiently decentralized or secure. So here we are focusing on Proof of Stake (PoS) concept which is a response to the treat of centralization.
Abstrak: Beberapa tahun terakhir eksistensi Pancasila dalam fungsinya sebagai dasar negara (philophische grondslag) dan pandangan hidup bangsa (weltanschauung) dipertaruhkan. Banyak tantangan dan rintangan yang dihadapi oleh Pancasila dalam mempertahankan eksistensinya. Kemerosotan nilai-nilai bangsa menjadi tantangan tersendiri yang dihadapi oleh Pancasila. Terorisme, radikalisme, narkoba, korupsi, hilangnya toleransi serta melunturnya rasa nasionalisme dan patriotisme sudah menjadi bukti merosotnya nilai-nilai kebangsaan. Mahasiswa sebagai agent of change harus peka dalam melihat situasi ini dan diharapkan mempunyai solusi dalam memecahkan masalah merosotnya nilai-nilai kebangsaan. Penelitian ini bertujuan untuk mengetahui persepsi mahasiswa terhadap fungsi Pancasila sebagai weltanschauung dalam upaya menghadapi merosotnya nilai-nilai kebangsaan. Lokasi penelitian di Program Studi Pendidikan Guru Sekolah Dasar Universitas Mataram. Pendekatan penelitian menggunakan kualitatif deskriptif. Metode pengumpulan data menggunakan wawancara, observasi dan dokumentasi. Analisis data menggunakan pengumpulan data, reduksi data, penyajian data dan penarikan kesimpulan. Tahap penelitian melalui tahap perencanaan dan pelaksanaan. Hasil penelitian menunjukkan bahwa: (1) mayoritas mahasiswa masih percaya bahwa Pancasila sebagai weltanschauung masih mampu menghadapi berbagai persoalan tentang merosotnya nilai-nilai kebangsaan. (2) diperlukan penanaman nilai-nilai pancasila melalui pendekatan multiapproach, multimedia, multidiscipline dan multistake holders dalam kehidupan sehari-hari. Kata Kunci: Pancasila, Philosopische Grondslag, Weltanschauung, Nilai-Nilai BangsaAbstract: The last few years of the existence of Pancasila in its function as the basic of the state (philophische grondslag) and the way of life (weltanschauung) were at stake. Terrorism, radicalism, drugs, corruption, loss of tolerance and the weakening of the sense of nationalism and patriotism have been proof of the decline of national values. Students as agents of change must be sensitive in seeing this situation and expected to have a solution in solving the problem of declining national values. This study aims to determine students' perceptions the function of Pancasila as a weltanschauung in an effort to deal with the decline of national values. The research location in the Universty of Mataram, Elementary School Teacher Education Study Program. The research approach uses descriptive qualitative. Methods of data collection using interviews, observation and documentation. Data analysis using data collection, data reduction, data presentation and conclusion. Research phase through the planning and implementation stages. The results of the study show that: (1) the majority of students still believe that the Pancasila as a weltanschauung is still able to face various problems regarding the decline of national values. (2) it is necessary to cultivate the values of the Pancasila through a multimedia, multidiscipline and multistakeholder approach in daily life.Keywords: Pancasila, Philosopische Grondslag, Weltanschauung, National Values
Lee Ki-Kwang, Suji Cho, Gyungsu Min, Cheol‐Won Yang
This paper analyzes the factors affecting the price of Bitcoin which has recently received a lot of attention. Specifically, we distinguish three factors of supply and demand, real economic factors, and psychological factors, and examine the effect of these variables on Bitcoin price. This is related to the issues that crypto-currency can function like real money, or it can replace financial investment assets such as existing stock markets as an investment alternative, what effect it has on the real economy, and it will rely on investorsâ attention and psychology. The results of this study show that the price of Bitcoin is more influenced by investorsâ attention and psychological factors such as Naver trend index and newspaper articles, rather than being influenced by rational variables such as supply and demand variables or real economic variables. This means that Bitcoin fever and downfall were more likely to be irrational bubbles than were supported by economic value. Key words: Crypto-Currency; Bitcoin; Real Economy; Demand and Supply; Psychological Factor JEL Classification: G11, G12, G41
Kakuro is a popular logic puzzle, in which a player fills in all empty squares with digits from 1 to 9 so that the sum of digits in each (horizontal or vertical) line is equal to a given number, called a clue, and digits in each line are all different. In 2016, Bultel, Dreier, Dumas, and Lafourcade proposed a physical zero-knowledge proof protocol for Kakuro using a deck of cards; their proposed protocol enables a prover to convince a verifier that the prover knows the solution of a Kakuro puzzle without revealing any information about the solution. One possible drawback of their protocol would be that the protocol is not perfectly extractable, implying that a prover who does not know the solution can convince a verifier with a small probability; therefore, one has to repeat the protocol to make such an error become negligible. In this paper, to overcome this, we design zero-knowledge proof protocols for Kakuro having perfect extractability property. Our improvement relies on the ideas behind the copy protocols in the field of card-based cryptography. By executing our protocols with a real deck of physical playing cards, humans can practically perform an efficient zero-knowledge proof of knowledge for Kakuro.
In the era of the Internet of information, we have gone through layering, cross-layer, and cross-system design paradigms. Recently, the ``curse of modeling" and ``curse of dimensionality" of the cross-system design paradigm have resulted in the popularity of using artificial intelligence (AI) to optimize the Internet of information. However, many significant research challenges remain to be addressed for the AI approach, including the lack of high-quality training data due to privacy and resources constraints in this data-driven approach. To address these challenges, we need to take a look at humans' cooperation in a larger time scale. To facilitate cooperation in modern history, we have built three major technologies: ``grid of transportation", ``grid of energy", and ``the Internet of information". In this paper, we argue that the next cooperation paradigm could be the ``Internet of intelligence (Intelligence-Net)", where intelligence can be easily obtained like energy and information, enabled by the recent advances in blockchain technology. We present some recent advances in these areas, and discuss some open issues and challenges that need to be addressed in the future.
Standard security protocols like SSL, TLS, IPSec etc. have high memory and processor consumption which makes all these security protocols unsuitable for resource constrained platforms such as Internet of Things (IoT). Blockchain (BC) finds its efficient application in IoT platform to preserve the five basic cryptographic primitives, such as confidentiality, authenticity, integrity, availability and non-repudiation. Conventional adoption of BC in IoT platform causes high energy consumption, delay and computational overhead which are not appropriate for various resource constrained IoT devices. This work proposes a machine learning (ML) based smart access control framework in a public and a private BC for a smart city application which makes it more efficient as compared to the existing IoT applications. The proposed IoT based smart city architecture adopts BC technology for preserving all the cryptographic security and privacy issues. Moreover, BC has very minimal overhead on IoT platform as well. This work investigates the existing threat models and critical access control issues which handle multiple permissions of various nodes and detects relevant inconsistencies to notify the corresponding nodes. Comparison in terms of all security issues with existing literature shows that the proposed architecture is competitively efficient in terms of security access control.
In this research paper the researcher given the analysis report of blockchain technology and its significant usage in new era of digital economy. The researcher stated that block chain technology is a network software protocols that enables the secure transfer of money, assets, and information via the internet, without need a third party intermediary. The researcher focused on some of the significant research issues and new dimension of centralized data centers, distributed ledger technology, specific times tamped with a unique cryptographic signature, tamper-proof auditable history of all transactions. In current scenario the block chain technology provides highly secure data in all aspects using cryptography, fingerprint that verifies the authenticity of the data. Alteration of the original data causes the hash of the altered data to no longer match the original fingerprint. Transactions on the blockchain are grouped and stored in blocks. The combined hash of these transactions is also stored, and each subsequent block saves the combined hash of the previous block. The resulting digital applications are digital asset registries, blockchains as leapfrog technology for global financial inclusion, long-tail personalized economic services, and net settlement payment secure channels which provides a new era of digital economy. In this research article the researcher focused on some of the significant research issues and challenges, statistical report of current blockchain technology usage and future direction for highly secure technology of new era of digital economy.
The article explores issues related to current problems of the public financial system. The author notes that the concept of the financial system belongs to economic categories and occupies a special place in a number of legal values. It is noted that the current financial legislation does not define the concept of the financial system, although the legal acts use such terms as the budget system, the tax system, the banking system, the monetary system, the credit system, the monetary system. However, their legislative definitions are also absent. This leads to a different interpretation of this concept and, accordingly, to a different understanding of its content and structure. It is recognized that the public nature of public economic relations related to the sphere of finance, money and credit, largely determines their financial and legal content, that is, the regulation of financial law as a public right. It is argued that the role of constituent legal institutions in the financial system of any country is not equal. Attention is drawn to such major financial and legal institutions as the budgetary system, the tax system, the banking system and the monetary system, without which the functioning of the financial system is impossible. The main task of today must be the desire for the stability of the public financial system as a whole and the harmonious interaction of all financial and legal institutions. The public financial system is a complex multifaceted financial and legal phenomenon that substantially covers the totality of centralized and decentralized public funds and those of individuals and legal entities. There is a need for a notion of the public financial system, as the global financial crisis has shown to be the most vulnerable, and the effects of globalization are becoming more and more visible to it.
Blockchain technology is emerging in every field. Blockchain is a constantly growing ledger that keeps a permanent record of all the transactions that have taken place in a distributed, decentralized and immutable way. Supply Chain Management is a broad range of activities that involve the management of the flow of goods and services, from the point of inception to the point of consumption. Blockchain technology can i) assure provenance tracking and traceability across the supply chain management ii) improves the quantity, quality and access to information at every step of the way across the chain iii) provides a more transparent way to provide data or information at a given instance of time. Blockchain technology can also be adapted in the supply chain management to overcome its disadvantages. The paper shows different case studies where the benefits of applying blockchain technology in supply chain management are appealing that has shown many benefits. It highlights the cases that have reduced fraud and errors; mitigate risks and provide data transparency and privacy, etc. The paper shows the creation of a general blockchain network and the information passing mechanism which is used to pass the information among the participants across the supply chain. With information passing mechanism we can provide data transparency to the consumers across the supply chain.
The article presents partial results of a comparative research that aims to discuss federalism as a form of organization of the State and its repercussions for the organization and financing of basic education in Argentina and Brazil. Documentary analysis methodology was used and special attention was given to the legal documents that organize and regulate the federative relations in education and in the financing of education in both countries. As the main findings are the fact that the supply and financing of basic education are decentralized, under the marked responsibility of the subnational ones, although there are mechanisms of action of the national one in the financing of education, either by repairing resources or acting in a complementary way.
After Bitcoin Introduced around the world, many Cryptocurrencies was created that followed the standard of bitcoin. The use of Bitcoin or other Cryptocurrency as a currency is also an interesting study from an Islamic economic perspective. They tried to use gold with value back by gold , which gold itself is famous for its exchange rate stability. From abu bakar There is a need for monitoring organization of the cryptocurrency, to controlling from Riba (Interest), Maysir (gambling) and ghahar (Uncertainty). To solve this problem there is a need a tool that can predict with certainty based on valid historical data, to produce accurate prediction results and produce Economic value estimations that are close to Gold real value. With the results we can monitoring day by day, see next day value and continuously based on Cryptocurrency with value back by gold, and see what other impact influences the value by looking the factor negative or positive with sentiment analysis. In the last section we discuss and provide method that we analyse from previous work to produce method to estimate value cryptocurrency value back by gold.