• Title, Summary, Keyword: Block Chain

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SPCBC: A Secure Parallel Cipher Block Chaining Mode of Operation based on logistic Chaotic Map

  • El-Semary, Aly M.;Azim, Mohamed Mostafa A.;Diab, Hossam
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.11 no.7
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    • pp.3608-3628
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    • 2017
  • Several block cipher modes of operation have been proposed in the literature to protect sensitive information. However, different security analysis models have been presented for attacking them. The analysis indicated that most of the current modes of operation are vulnerable to several attacks such as known plaintext and chosen plaintext/cipher-text attacks. Therefore, this paper proposes a secure block cipher mode of operation to thwart such attacks. In general, the proposed mode combines one-time chain keys with each plaintext before its encryption. The challenge of the proposed mode is the generation of the chain keys. The proposed mode employs the logistic map together with a nonce to dynamically generate a unique set of chain keys for every plaintext. Utilizing the logistic map assures the dynamic behavior while employing the nonce guarantees the uniqueness of the chain keys even if the same message is encrypted again. In this way, the proposed mode called SPCBC can resist the most powerful attacks including the known plaintext and chosen plaintext/cipher-text attacks. In addition, the SPCBC mode improves encryption time performance through supporting parallelized implementation. Finally, the security analysis and experimental results demonstrate that the proposed mode is robust compared to the current modes of operation.

A Study on Privacy and Information Protection in Distributed Network Environment - Focused on Blockchain - (P2P 분산 네트워크 환경 내 프라이버시 및 정보보호 방안 - 블록체인 중심으로 -)

  • Park, Sumin;Hong, Seng-phil
    • Journal of Security Engineering
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    • v.14 no.2
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    • pp.167-180
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    • 2017
  • The smart contract of the block chain is a technology that guarantees the reliable contract without intermediary third party, and various studies are being carried out in various fields. When smart contracts are placed on the block chain, if the sensitive information of the contracting parties is registered, it may become an example of infringement of personal information. However, research on privacy and information protection among the research using the block chain smart contract seems to be insufficient. In this paper, we propose a design method to solve this issue by deriving the issue of reliable block chain smart contract and contribute to making it safe to use in P2P distributed network environment through case study.

A Study on the Acceptance Intention and Usage Behavior of Blockchain Technology : From the Perspective of Unified Theory of Acceptance and Use of Technology (통합기술수용이론 관점에서 블록체인기술의 사용자 수용과 이용 행동에 관한 연구)

  • Kim, Byung-Gon;Lee, Byeong-Gil;Yoon, Il-Ki
    • Journal of Information Technology Applications and Management
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    • v.27 no.3
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    • pp.1-18
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    • 2020
  • Recently, following the development of FinTech technology that combines finance and information and communication technology, the need and social demands for a block chain technology-based trading system have increased significantly. In this study, a research model was developed and hypothesized through literature research on the concept of block chain technology, the technology acceptance model, and the unified theory of acceptance and use of technology. The research theories were tested by collecting data through surveys and analyzing the collected data. This study conducted empirical research to identify the factors influencing the user acceptance intention and utilization behavior of the block chain technology in introducing the block chain technology. First, factors affecting the acceptance intention of the blockchain user were performance expectation, effort expectation, social impact, and blockchain transparency variables. Second, the facilitation conditions and stakeholder confidence variables were analyzed as factors that did not affect the acceptability of the blockchain users. Third, variables such as blockchain transparency, stakeholder trust and intention of acceptance are factors that affect the usage behavior of the blockchain. Fourth, it was confirmed that the acceptance intention had a very high explanatory power on usage behavior of Blockchain technology.

The Future of BlockChain Technology Leading Innovation in the Industrial Ecosystem (산업 생태계의 혁신을 선도할 블록체인 기술의 미래전망)

  • Kim, Jung-Sook
    • The Journal of the Korea Contents Association
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    • v.18 no.6
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    • pp.324-332
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    • 2018
  • Blockchain technology has the potential to revolutionize trust models and business processes in a variety of industries. However, it is considered to be the initial stage of the system that pursues autonomy rather than efficiency, and it is necessary to monitor and inspect the distributed ledger technology from the price and introduction time as compared with the existing relational DB transaction technology. However, domestic and foreign private sectors have already been activated by applying block-chain technology in the national domain, and the block chain is devoid of doubt that it is an exaggerated technology, characterized by the invariance of the record, transparency, and autonomous execution of business rules. It has begun to be utilized in history, identity, certification and auditing in the financial industry as well as various industries. In this paper, we analyze the problems such as security weakness, insufficient regulatory environment, technical consensus and lack of common standard. In addition, the business sense and possibility of the block chain technology is expected to be the innovation of the industrial ecosystem by entering into the reality system from the concept through monitoring the actual introduction performance in the field of copyright, logistics, health care and environment.

High-quality data collection for machine learning using block chain (블록체인을 활용한 양질의 기계학습용 데이터 수집 방안 연구)

  • Kim, Youngrang;Woo, Junghoon;Lee, Jaehwan;Shin, Ji Sun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.23 no.1
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    • pp.13-19
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    • 2019
  • The accuracy of machine learning is greatly affected by amount of learning data and quality of data. Collecting existing Web-based learning data has danger that data unrelated to actual learning can be collected, and it is impossible to secure data transparency. In this paper, we propose a method for collecting data directly in parallel by blocks in a block - chain structure, and comparing the data collected by each block with data in other blocks to select only good data. In the proposed system, each block shares data with each other through a chain of blocks, utilizes the All-reduce structure of Parallel-SGD to select only good quality data through comparison with other block data to construct a learning data set. Also, in order to verify the performance of the proposed architecture, we verify that the original image is only good data among the modulated images using the existing benchmark data set.

Synthesis of Poly(ethylene oxide-b-acrylonitrile) Block Copolymers with Higher Polyacrylonitrile Content Using Controlled Radical Polymerization Techniques (조절 라디칼 중합법을 이용한 PAN 함량이 많은 PEO-b-PAN 블록 공중합체의 합성)

  • Kim, Tae-Young;Kwark, Young-Je
    • Textile Science and Engineering
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    • v.52 no.1
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    • pp.20-25
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    • 2015
  • Poly(ethylene oxide-b-acrylonitrile) (PEO-b-PAN) block copolymers were prepared as precursors to mesoporous carbons. Redox-initiated radical polymerization and controlled radical polymerization techniques, such as reversible addition-fragmentation chain transfer (RAFT) and activators regenerated by electron transfer atom-transfer radical polymerization (ARGET ATRP), were successfully applied to prepare PEO-b-PAN block copolymers with high PAN content. Radical polymerization of acrylonitrile (AN) using ceric ion as redox initiator gave block copolymers with PEO:PAN ratio of up to 1:38.4, but their high molecular weight and polydispersity index (PDI) indicated that the structure was not controlled. Therefore, in order to achieve better control on the structure of the PAN block, controlled radical polymerization techniques were used. Poly(ethylene oxide) with trithiocarbonate (PEO-CTA) and bromide (PEO-Br) end groups were synthesized as polymeric chain transfer agent for the RAFT process and as initiator for the ATRP process, respectively. The RAFT process of AN using PEO-CTA gave block copolymers with PAN block length 0.53-3.58 times that of the PEO block. Moreover, ARGET ATRP allowed to prepare block copolymers with a very high molecular weight of 72,000, while maintaining a PDI value as low as 1.20.

Clipping of T2 Sympathetic Chain Block for Essential Hyperhidrosis (다한증 환자에서의 Clipping에 의한 T2 Sympathetic Chain Block의 효과)

  • 이두연;윤용한;백효채;신화균;이성수;강정신
    • The Korean Journal of Thoracic and Cardiovascular Surgery
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    • v.32 no.8
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    • pp.745-748
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    • 1999
  • Background: A definitive cure for an essential hyperhidrosis can be obtained by an upper thoracic sympathectomy. However, this is offset by the occurrence of a compensatory hyper hidrosis as a side effect and it is irreversible. We performed a thoracoscopic sympathetic chain block using an endoscopic clip in order to avoid the compensatory hyperhidrosis. Material and Method: From Aug. 1998 to Nov. 1998, 42 cases of thoracoscopic clipping of the T2 sympathetic chain were performed. The sympathetic chain was clipped using an endoscopic clip instead of cutting. Result: Bilateral procedure took less than 40 minutes and occasionally necessitated one night in the hospital. There were no mortality nor life- threatening complications. Horners syndrome occurred in two cases. At the end of postoperative follow-up(median 3 months), 95.0% of the patients were satisfied with the results. Compensatory sweating occurred in 31 cases(77.5%) where nine of those cases were classified as either embarrassing(6 cases-15.0%) or disabling(3 cases-7.5%). Conclusion: Endoscopic thoracic T2 sympathetic chain block using endoscopic clipping is an efficient, safe and minimally invasive surgical method for the treatment of palmar and craniofacial hyperhidrosis and the results were similar to those underwent T2 sympathicotomy. We recommend that patients receive endoscopic sympathetic chain block in summer.

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A Proposal for Mobile Gallery Auction Method Using NFC-based FIDO and 2 Factor Technology and Permission-type Distributed Director Block-chain (NFC 기반 FIDO(Fast IDentity Online) 및 2 Factor 기술과 허가형 분산원장 블록체인을 이용한 모바일 갤러리 경매 방안 제안)

  • Noh, Sun-Kuk
    • Journal of Internet Computing and Services
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    • v.20 no.6
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    • pp.129-135
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    • 2019
  • Recently, studies have been conducted to improve the m-commerce process in the NFC-based mobile environment and the increase of the number of smart phones built in NFC. Since authentication is important in mobile electronic payment, FIDO(Fast IDentity Online) and 2 Factor electronic payment system are applied. In addition, block-chains using distributed raw materials have emerged as a representative technology of the fourth industry. In this study, for the mobile gallery auction of the traders using NFC embedded terminal (smartphone) in a small gallery auction in which an unspecified minority participates, password-based authentication and biometric authentication technology (fingerprint) were applied to record transaction details and ownership transfer of the auction participants in electronic payment. And, for the cost reduction and data integrity related to gallery auction, the private distributed director block chain was constructed and used. In addition, domestic and foreign cases applying block chain in the auction field were investigated and compared. In the future, the study will also study the implementation of block chain networks and smart contract and the integration of block chain and artificial intelligence to apply the proposed method.

Training of Accounting Professionals Following the Introduction of Block Chain Technology (블록체인 기술 다식부기 시스템 도입에 따른 회계전문인 육성 방안)

  • Yang, Haejin;Bae, Kheesu
    • Journal of Information Technology Applications and Management
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    • v.26 no.4
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    • pp.41-50
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    • 2019
  • Block chain technology revolutionizes the 'double entry bookkeeping' of accounting principles in 600 years. It will be an opportunity for you to become one. The advent of the block chain will revolutionize the accounting world. It is no exaggeration to say that it is a skill. The use of block chains for accounting leads to the occurrence of transactions. It's easy to identify a transaction, and it's easy to fake or tamper with it. The accounting industry because it is difficult to communicate transparent accounting information to stake holders. Transformations will be possible across the board (Carlozo, 2017). An entity shall provide financial information that is useful to interested parties in making reasonable economic decisions. Transactions arising from business activities are recorded and provided in the books. Interested parties are here. We need to make decisions to protect our interests and make those decisions rationally. To make a decision, we know how the outcome of the decision will affect our self-interest. Because it has to do so, it uses corporate information for this purpose. But the investor is one way of doing business. It is difficult to trust the information provided by (Yermack, 2017). As a result, ICO companies, startups, small businesses lose a lot of business opportunities because they don't have investors. In addition, the management mixes cash flows with accounting interests to indicate changes in cash flows. It experiences failure in its business due to its inability to analyze and predict faithfully. But it's a blockhead in accounting. Applying the factors and recording them in the book will result in a number of benefits for different stake holders. It can be provided. The financial information in the block chain is not subject to further review or verification. It can improve the timeliness and increase reliability of financial information because it cannot be forged or tampered with (Delloitte, 2016). Based on the fourth industrial revolution, the pace of change in all sectors of society has never been faster. Based on block chain technology, decision-making structure is based on vertical structure of the past. Transforming into a horizontal structure collapses existing tools and advances transparency and decentralization a change of Copernican interpersonal awareness with the trend of the times, which is becoming angry with modern people.

Research for the convergence of IoT and Blockchain (사물인터넷과 블록체인 융합에 관한 연구)

  • Lee, YongJoo;Woo, Sung-Hee
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.507-509
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    • 2018
  • Recently, the research for IoT technologies has been established actively, however the structure of centralized network has been pointed out as the vulnerable points. To solve these problems such as system load and security vulnerability, the research to introduce block chain technology is needed. In this paper, we propose the network domain for convergence of block chain and IoT platform, and describe the advantages from the convergence and various and applicable fields.

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