Preservation Authentication and Authorization on Blockchain

Ali, Wasan Ahmed; Sahib, Naji Mutar; Waleed, Jumana

doi:10.1109/iiceta47481.2019.9012996

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…The total heat power W/m² The received total heat power (flux) for each experimental EDM machining subgroup parametric was analyzed. The experimentally obtained results were modeled by using the three full factorial level response surface methodology (RSM), the analysis of variance (ANOVA), and the statistical design expert system 10.0 software [38], to investigate the significant contribution of the parameters on the responses [39]. By using the graphite and copper tools electrodes, the analysis results for the modeled heat flux (total) that generated by the EDM experiments for all machining experimental sub-groups are demonstrated in Figs.…”

Section: Materials Science and Modern Manufacturingmentioning

confidence: 99%

The Effect of Electrical Discharge Machining Total Heat Generated on White Layer Thickness (WLT) and Fatigue Life for Die Steel

Ali

Al-Khazraji

Amin

2021

MSF

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The present paper concerns with studying the high complexity nature of the EDM multiple discharge analysis transformed into a feasible solvable mathematical model for the die steel workpiece type AISI D2, the copper and graphite materials electrodes, and the kerosene dielectric by setting the Transient Thermal and the Multiphysics analyses domain loads models using the ANSYS 15.0 finite element analysis. Two load steps modeled the entering setting time analysis, six sub-periods setting time cycle, four heating, and two cooling periods, six transient temperature values, and four transient thermal convection models. The radius spark (discharge channel), the total number of discharges sparks, the total heat power generation, the absorbed heat flux fractions by the electrodes, the workpieces and kerosene fluid dielectric, the heat-affected zones (HAZ), the hard white recast layer thickness (WLT) and properties, the workpiece fatigue safety factor and life after EDM machining were determined and simulated. The thermal model errors compared with theoretical calculations and a modeled predicted equation were also deduced and verified. The experimental results evinced that the maximum total heat flux generated using the graphite material electrodes is (2.619E+009 W/m2) which is higher than when using copper material electrodes by (82.4%), while the minimum value of the white layer thickness (WLT) after EDM machining using graphite tool electrodes is (8.34 μm), which it gives an improvement comparing with using of copper tool electrodes by (40.0%). The macrographic and microstructure evaluation manifest that the discharge spark craters sizes when using graphite tool electrodes reached their sizes. The maximum fatigue stresses and fatigue safety factor when using copper tool electrodes are (240 MPa) and (0.89) which is higher by a value of (3.35%) and (3.45%) comparing with the using of graphite electrodes, respectively.

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Section: Materials Science and Modern Manufacturingmentioning

confidence: 99%

The Effect of Electrical Discharge Machining Total Heat Generated on White Layer Thickness (WLT) and Fatigue Life for Die Steel

Ali

Al-Khazraji

Amin

2021

MSF

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“…Recently, some researchers have introduced blockchain technology into identity authentication [25][26][27]. In [15], the authors proposed a blockchain-based identity management and authentication scheme for mobile networks, where users' identifying information is controlled by the users themselves.…”

Section: Introductionmentioning

confidence: 99%

A Privacy-Preserving Identity Authentication Scheme Based on the Blockchain

Gao

Zhang

et al. 2021

Security and Communication Networks

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Traditional identity authentication solutions mostly rely on a trusted central entity, so they cannot handle single points of failure well. In addition, most of these traditional schemes need to store a large amount of identity authentication or public key information, which makes the schemes difficult to expand and use in distributed situations. In addition, the user prefers to protect the privacy of their information during the identity verification process. Due to the open and decentralized nature of the blockchain, the existing identity verification schemes are difficult to apply well in the blockchain. To solve this problem, in this article, we propose a privacy protection identity authentication scheme based on the blockchain. The user independently generates multiple-identity information, and these identities can be used to apply for an identity certificate. Authorities use the ECDSA signature algorithm and the RSA encryption algorithm to complete the distribution of the identity certificate based on the identity information and complete the registration of identity authentication through the smart contract on the blockchain. On the one hand, it can realize the protection of real identity information; on the other hand, it can avoid the storage overhead caused by the need to store a large number of certificates or key pairs. Due to the use of the blockchain, there is no single point of failure in the authentication process, and it can be applied to distributed scenarios. The security and performance analysis show that the proposed scheme can meet security requirements and is feasible.

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