• Title/Summary/Keyword: ABE

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Modeling Sedimentation Process in Ipjang Reservoir using SWAT and EFDC (SWAT-EFDC 연계 모델링을 통한 입장저수지의 유사 해석)

  • Shin, Sat Byeol;Hwang, Soon-Ho;Her, Younggu;Song, Jung Hun;Kim, Hak Kwan;Kang, Moon Seong
    • Journal of The Korean Society of Agricultural Engineers
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    • v.60 no.3
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    • pp.135-148
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    • 2018

  • Reservoir sedimentation is a major environmental issue, and various sediment load controls and plans have been proposed to secure clean and safe water resources. The objectives of this study were to estimate soil loss in the upper basins and predict sediment deposition in Ipjang reservoir using hydrologic and hydraulic model. To do so, SWAT (Soil and Water Assessment Tool) and EFDC (Environmental Fluid Dynamics Code) was used to estimate soil loss in two upper basins and to predict spatial distribution and amount of sediment deposition in the Ipjang reservoir, respectively. The hydrologic modeling results showed that annual average soil loss from the upper basins was 500 ton. The hydraulic modeling results demonstrated that sediment particles transported to the reservoir were mostly trapped in the vicinity of the reservoir inlet and then moved toward the bank over time. If long-term water quality monitoring and sediment survey are performed, this study can be used as a tool for predicting the dredging amount, dredging location and proper dredging cycle in the reservoir. The study findings are expected to be used as a basis to establish management solutions for sediment reduction.

  • https://doi.org/10.5389/KSAE.2018.60.3.135 인용 PDF KSCI

Towards efficient sharing of encrypted data in cloud-based mobile social network

  • Sun, Xin;Yao, Yiyang;Xia, Yingjie;Liu, Xuejiao;Chen, Jian;Wang, Zhiqiang
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.10 no.4
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    • pp.1892-1903
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    • 2016

  • Mobile social network is becoming more and more popular with respect to the development and popularity of mobile devices and interpersonal sociality. As the amount of social data increases in a great deal and cloud computing techniques become developed, the architecture of mobile social network is evolved into cloud-based that mobile clients send data to the cloud and make data accessible from clients. The data in the cloud should be stored in a secure fashion to protect user privacy and restrict data sharing defined by users. Ciphertext-policy attribute-based encryption (CP-ABE) is currently considered to be a promising security solution for cloud-based mobile social network to encrypt the sensitive data. However, its ciphertext size and decryption time grow linearly with the attribute numbers in the access structure. In order to reduce the computing overhead held by the mobile devices, in this paper we propose a new Outsourcing decryption and Match-then-decrypt CP-ABE algorithm (OM-CP-ABE) which firstly outsources the computation-intensive bilinear pairing operations to a proxy, and secondly performs the decryption test on the attributes set matching access policy in ciphertexts. The experimental performance assessments show the security strength and efficiency of the proposed solution in terms of computation, communication, and storage. Also, our construction is proven to be replayable choosen-ciphertext attacks (RCCA) secure based on the decisional bilinear Diffie-Hellman (DBDH) assumption in the standard model.

  • https://doi.org/10.3837/tiis.2016.04.024 인용 PDF KSCI KPUBS HTML

GDPR Compliant Blockchain Based Access Control(GCBAC) (GDPR 준수 가능한 블록체인 기반 접근제어 시스템)

  • Lim, Joon Ho;Chun, Ji Young;Noh, Geontae;Jeong, Ik Rae
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.30 no.6
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    • pp.981-997
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    • 2020

  • Blockchain technology can provide a high level security based on a decentralized distributed ledger and consensus-based structure. In order to increase the utilization of blockchain technology, it is necessary to find a way to use it in fields that require personal data processing such as health care and e-commerce. To achieve this goal, the blockchain based system should be able to comply with data privacy regulations represented by European Union(EU)'s GDPR(General Data Protection Regulation). However, because of the properties of the blockchain like the immutability and decentralized recorded data, it is difficult to technically implement the requirements of the existing privacy regulations on the blockchain. In this paper, we propose a multi-chain based access control system that can guarantee the rights of the personal data subject required by GDPR by utilizing Chameleon Hash and Attribute Based Encryption (ABE). Finally, we will show through security analysis that our system can handle personal data while maintaining confidentiality and integrity.

  • https://doi.org/10.13089/JKIISC.2020.30.6.981 인용 PDF KSCI HTML