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Study of the Ionic Conduction Mechanism Based on Carboxymethyl Cellulose Biopolymer Electrolytes
A. S. Samsudin,M. I. N. Isa 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.9
Biodegradable carboxymethyl cellulose (CMC) doped with various compositions of NH4Brbiopolymer electrolytes (BE) were successfully prepared via a solution-cast technique. The ionicconductivity for the CMC-NH4Br BE system was measured by using impedance spectroscopy, andthe highest ambient temperature conductivity was observed to be 1.12 × 10−4 S cm−1 for thesample containing 25-wt.% NH4Br. The temperature dependence of the ionic conductivity revealedthat the BE system followed an Arrhenius behavior. Jonscher’s universal power law was applied toanalyze the AC conductivity of the highest conducting sample in the BE system, and the resultsindicate that the conduction is due to small polaron hopping (SPH) caused by a non-adiabaticmechanism.
Improving the Diffusion of the Stream Cipher Salsa20 by Employing a Chaotic Logistic Map
Almazrooie, Mishal,Samsudin, Azman,Singh, Manmeet Mahinderjit Korea Information Processing Society 2015 Journal of information processing systems Vol.11 No.2
The stream cipher Salsa20 and its reduced versions are among the fastest stream ciphers available today. However, Salsa20/7 is broken and Salsa20/12 is not as safe as before. Therefore, Salsa20 must completely perform all of the four rounds of encryption to achieve a good diffusion in order to resist the known attacks. In this paper, a new variant of Salsa20 that uses the chaos theory and that can achieve diffusion faster than the original Salsa20 is presented. The method has been tested and benchmarked with the original Salsa20 with a series of tests. Most of the tests show that the proposed chaotic Salsa of two rounds is faster than the original four rounds of Salsa20/4, but it offers the same diffusion level.
Improving the Diffusion of the Stream Cipher Salsa20 by Employing a Chaotic Logistic Map
( Mishal Almazrooie ),( Azman Samsudin ),( Manmeet Mahinderjit Singh ) 한국정보처리학회 2015 Journal of information processing systems Vol.11 No.2
The stream cipher Salsa20 and its reduced versions are among the fastest stream ciphers available today. However, Salsa20/7 is broken and Salsa20/12 is not as safe as before. Therefore, Salsa20 must completely perform all of the four rounds of encryption to achieve a good diffusion in order to resist the known attacks. In this paper, a new variant of Salsa20 that uses the chaos theory and that can achieve diffusion faster than the original Salsa20 is presented. The method has been tested and benchmarked with the original Salsa20 with a series of tests. Most of the tests show that the proposed chaotic Salsa of two rounds is faster than the original four rounds of Salsa20/4, but it offers the same diffusion level.
A Survey of Homomorphic Encryption for Outsourced Big Data Computation
( Tan Soo Fun ),( Azman Samsudin ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.8
With traditional data storage solutions becoming too expensive and cumbersome to support Big Data processing, enterprises are now starting to outsource their data requirements to third parties, such as cloud service providers. However, this outsourced initiative introduces a number of security and privacy concerns. In this paper, homomorphic encryption is suggested as a mechanism to protect the confidentiality and privacy of outsourced data, while at the same time allowing third parties to perform computation on encrypted data. This paper also discusses the challenges of Big Data processing protection and highlights its differences from traditional data protection. Existing works on homomorphic encryption are technically reviewed and compared in terms of their encryption scheme, homomorphism classification, algorithm design, noise management, and security assumption. Finally, this paper discusses the current implementation, challenges, and future direction towards a practical homomorphic encryption scheme for securing outsourced Big Data computation.
ROSS: Low-Cost Self-Securing VoIP Communication Framework
( Alfin Syafalni ),( Azman Samsudin ),( Yazid Jaafar ),( Mohd Adib Omar ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.12
Reliance on the Internet has introduced Voice over Internet Protocol (VoIP) to various security threats. A reliable security protocol and an authentication scheme are thus required to prevent the aforementioned threats. However, an authentication scheme often demands additional cost and effort. Accordingly, a security framework for known participants in VoIP communication is proposed in this paper. The framework is known as Randomness-Optimized Self-Securing (ROSS), which performs authentication automatically throughout the session by optimizing the uniqueness and randomness of the communication itself. Elliptic Curve Diffie-Hellman (ECDH) key exchange and Salsa20 stream cipher are utilized in the framework correspondingly to secure the key agreement and the communication with low computational cost. Human intelligence supports ROSS authentication process to ensure participant authenticity and communication regularity. The results show that with marginal overhead, the proposed framework is able to secure VoIP communication by performing reliable authentication.
( Munirah Sha` Ban ),( Samsudin Osman Cassim ),( Nor Hamdan Mohd Yahya ),( Aminuddin Bin Saim ),( Ruszymah Bt Hj Idrus ) 한국조직공학·재생의학회 2011 조직공학과 재생의학 Vol.8 No.1
In this study, we are taking step to actively manage osteoarthritis that may help gain control over osteoar-thritic pain and delay the degenerative changes in articular cartilage in future. We transiently over expressed cartilage transcriptional factor, human sox-9 gene in chondrocytes derived from consented osteoarthritic patients after joint surgery. The expression vector carrying human sox-9 gene, pAdTrack-sox9 was transformed into One Shot® TOP10 Chemically Competent E. coli according to the manufacturer protocol. Plasmid purification was performed in accordance with QIAGEN® plasmid purification kit procedure. We compared the efficiency between two transfection techniques i.e. lipofection using Lipofectamine™ 2000 kit from Invitrogen, USA and nucleofection using Human Chondrocytes Nucleofector® kit from Amaxa Biosystem, Germany. Chondrocytes were cultured and transfected with sox-9 gene at passage 1 according to the manufacturers’ protocols. Transfected chondrocytes were expanded until passage 3. Expression of chondrogenic markers namely collagen type II, aggrecan core protein and sox-9 were evaluated by quantitative RT-PCR method using iScriptTM One Step RT-PCR Kit with SYBR® Green, BIO-RAD. Chondrogenic dedifferentiation marker, collagen type I was also analyzed using the quantitative RT-PCR method. Expression level of each targeted gene was normalized to the housekeeping gene, human glyceraldehyde-3-phosphate dehydrogenase (GAPDH). Overall efficiency ranging from 50% to 60% could be achieved using both transfection techniques. Transiently transfecting cells demonstrated remarkable competency sustaining specific chondrogenic genes namely collagen type II, aggrecan core protein and sox-9, significantly better than in the non-transfected cells. It is believed that this preliminary finding has to be extended to develop its full potential since sox-9 transcription factor is essential for chondrocyte differentiation and cartilage formation. Sox9 gene therapy would delay the degenerative changes in articular cartilage which is consistent to the up-regulation of cartilage-specific markers especially collagen type II synthesis in vivo.