The development of the Internet has increased the amount of data exponentially, and the reliable transmission, sharing, and storage of data have become the primary problems of data sharing. This article combines the decentralized and irreversible characteristics of the Ethereum blockchain, integrates IPFS distributed storage technology, and proposes a data sharing platform under a new technology environment to ensure data security, user rights protection, and high-speed data processing. Provide a new technology application environment for current data sharing.
Radio spectrum resource is a scarce resource. How to use the limited spectrum resource to provide users with the maximum communication opportunities is worth further study. In fact, the traditional “command and control” mode of spectrum management is very inefficient in the utilization of spectrum, resulting in a great waste of frequency resources. At the same time, in radio management, it is necessary to set up databases of different services to store different monitoring information. Although the system plays a certain control ability, the radio monitoring records form an island of information, and the information of each service does not circulate, which is not conducive to integrated management. In this paper, based on the current radio spectrum resources in dynamic spectrum sharing method of resource sharing, the spectrum value of trust transfer problem, and the information management system each other information, collaborative management difficulties and other issues, put forward a kind of spectrum sharing method based on blockchain and by business combining intelligent contract database, realize data sharing solution.
In order to understand the hot and forward trend of the research about the blockchain in the Chinese e-commerce field, it takes the literature in e-commerce field with the blockchain of the CNKI database as the sample, and it also uses CiteSpace V, SPSS21.0, Excel2010 and CNKI platform to carry out bibliometrics and visualization analysis. The energy distribution in the area of China's block chain research in e-commerce field is analyzed from the aspects of subject distribution, research level, source journals, author distribution, research institutions, fund projects and so on. And from the high frequency key words, key words social network and other dimensions depth analysis of the research hot spots and frontiers in the e-commerce field of block chain in Chinese academic circles. The study found: The research of China's block chain in the field of publishing has not yet started completely. It needs to be paid attention to by the academic circle, and its research field, scale of cooperation，scale and depth of research need to be strengthened. The research focuses mainly on the application of the agricultural products, the payment of e-commerce, the traceability of the electric business field and the regulatory aspects of the e-commerce. E-commerce segments, e-commerce related areas, e-commerce payment refinement, e-business logistics refinement, e-commerce finance, new technology or ideas related aspects are relatively cutting-edge potential research trends.
With the successful application of Bitcoin, the underlying blockchain technology has been attracted the attention by more and more scholars, financial institutions and commercial companies. Blockchain technology integrates some key technologies such as finance, cryptography, computer science, and game theory, and builds a distributed record system that is decentralized, mutually trusted, and tamper-proof. This paper demonstrates the basic principles and features of blockchain, then analyzes the key technologies and characteristics of blockchain technology including asymmetric encryption, P2P, consensus mechanisms, smart contracts. In the last part of the paper, the author summarizes the potential application scenarios to blockchain and focuses on applications of the blockchain technology in the power industry.
With the rapid growth of urbanization, smart city needs efficient and sustainable intelligent solutions in the transportation, environment, energy, government affairs. The smart city infrastructure, which combines the IoT, Big Data and Energy Internet, is one of the most effective solutions. It's facing many problems such as poor security of IoT, equipment maintenance and upgrade difficulty, high operating costs of large data center construction, poor resistance to damage, the difficulty of establishing the energy Internet users trust , user privacy is easy to leak, market model is not applicable and so on. The Blockchain is a kind of distributed P2P network common intelligence accounting technology based on cryptography. The features of open, transparent, interconnection and peer-to-peer, storage and sharing in the Blockchain are relevant to the openness, interconnection, peer-to-peer and Shared characteristics of the energy Internet. Its features of redundant storage and distribution also make up for the disadvantages of large data center's high operation cost, poor recovery ability and the difficulties for the maintenance of IoT equipment. This paper, first introduces the role of the big data, IoT, and the energy Internet in the construction of smart city and Blockchain technology. By analyzing their respective characteristics and comparing their similarities, corresponding solutions are put forward to aim at the problems such as poor security of IoT, upgrading of equipment maintenance and upgrading, construction and operation cost of large data center, poor flexibility in anti-attack, difficulty in establishing trust in energy Internet users, user privacy leakage and inapplicability of trading market mode. A kind of architecture of P2P light-heavy backup is put forward to overcome the high cost of Blockchain data storage.
The CPS system senses and recognizes the physical world through numerous node devices and processes the collected data accordingly, then it can achieve the interconnection of the physical world and the virtual network world. However, under the existing conditions, the CPS system has not yet realized the interconnection between nodes and nodes and the physical world. Block chain technology is a distributed ledger in which nodes can freely enter and exit. This article proposes to combine the block chain with the CPS system to improve the efficiency and security of the CPS system. Through theoretical analysis and experiments, it is proved that the combination of block chain and CPS system can effectively improve the scalability of CPS system and improve the ability of CPS system to communicate with the physical world. Through the combination of the public chain and private chain of the block chain, the production speed of the block is improved, and the actual demand of the CPS system is better satisfied.
This paper presents a multi-layer secure IoT network model based on blockchain technology. The model reduces the difficulty of actual deployment of the blockchain technology by dividing the Internet of Things into a multi-level de-centric network and adopting the technology of block chain technology at all levels of the network, with the high security and credibility assurance of the blockchain technology retaining. It provides a wide-area networking solution of Internet of Things.
Bitcoin has experienced such three stages as mininggame interior testing stage oriented by the demand of technical share revision,the business model construction stage oriented by investment demand and market bubble showcase stage oriented by the speculative demand since 2009 when Bitcoin produced,and has formed a global market to exchange Bitcoin. As a product of virtual financial market,Bitcoin market development is propelled by human spontaneousness and human oriented demand,however,the market craziness triggered by speculative demand not only damages the interests of the investors but also impedes the self-development of Bitcoin market. Bitcoin,which does not belong to the currency in real sense,has long-term development basis by widening and consolidating basic service function of network payment,but its value stability can not be maintained for a long time. Bitcoin,as a virtual currency,largely deviates from its intrinsic value in its market price currently,has big bubble,as a result,the investment or speculation on Bitcoin is the worst choice,therefore,China must make effective supervision on Bitcoin market and actively guide and broaden the channel for private capital to invest.
Based on ELGamal digital signature and zero-knowledge proof with the method of directed signature,a two-way identification scheme was proposed,which enabled two specific users to validate each other's identity without exposing one's own secret information.The scheme has higher security and lower computing complexity.
Leaking of the main key will make all other keys lose their functions.An algorithm of synthesizing the main key based on security tolerance is presented to avoid the problem.The main key was protected by distributing its shares to different key cards and the main key synthesizing server.Key cards,whose shares were modified,could be found by zero-knowledge proof technology.The project ensures that the compromise of a few system components does not compromise the secret information of the main key,and the main key is never reconstructed at a single online location.Security analysis proves that this algorithm makes the whole system have resilience and defence to collusive attack,and the system can keep working after it is attacked.
A non-interactive zero-knowledge proof protocol based on Elliptic Curve Encryption was proposed,and based this protocol,a publicly verified secret sharing scheme was proposed too.In the scheme,secret and secret shadow were embedded onto the points of Elliptic Curve,anybody can verify them publicly,and only the legitimate participants set can recover the secret key,but knowing nothing about the secret key.This scheme can prevent adversaries from getting the secret,the dealer from distributing improper data and the participants from cheating each other efficiently.Furthermore, it is propitious for the replication and update of secret.
A new scheme of identity authentication that has zero-knowledge characteristics is established based on RSA algorithm.The analysis of the scheme shows that the algorithm is legible,the mutual time and the opportuni-ty be cheated is less.Only one time proof,it can meet the reliability demands for which other zero-knowledge proof algorithms need much more time proof.
used of RSA arithmetic and Feige-Fiat-Shami digital agreement to proposal an double-direction mutual user attestation method, improved on Diffie-Hellman arithmetic, user cryptical communications project is constructed. The idea of zero-knowledge proof is used in this project to guarantee key security,and user’s communications content is hide higher.
Cognitive Computing and Networks
Advanced Computational Techniques and Applications
To prevent e-cash from double-spending and unlimited increase in the records of databases,an improved offline e-cash system based on elliptic curve cryptography was proposed.The improved system utilizes good properties of elliptic curve cryptography system and adopts zero knowledge proof.Partial blind signature based on elliptic curve cryptography ensures that the e-cash is valid only in the period issued by the bank according to the withdrawal protocol,and the historical record of the e-cash that exceeds the valid period will be removed,which greatly reduce the amount of traffic and effort of calculation and improve the efficiency.The security of the system was improved by adopting the elliptic curve zero knowledge proof in the payment protocol.
Group-oriented identity authentication is designed to satisfy some special security demands.It help to prevent the cheat of inner fellows and improve the security level and availability of identity authentication system,as well as strengthening the system sur-vivability.Combined with general ElGamal digital signature,shamir secret sharing and zero-knowledge proof,a group-oriented identity authentication scheme is designed,which can effectively resist familiar personate and conspiracy attack.