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In the present work, Aluminum Alloy 6061/10%SiC composite is machined using ZNC electrical discharge machining (EDM) process. Improvement in material removal rate (MRR) is explored using tungsten powder suspended dielectric fluid in EDM process (PMEDM). Peak current, pulse on time, pulse off time and gap voltage are studied as process parameters. Mathematical relation between process parameters and MRR is established on basis of Response Surface Methodology (RSM). The results obtained are further compared with MRR achieved from machining using simple EDM. The existence of tungsten particles in kerosene resulted 48.43% improvement in MRR. The influence of tungsten powder mixed dielectric fluid on machined surface are analyzed using Scanning Electron Microscope (SEM) and Energy Dispersive Spectroscopy (EDS). The results revealed improvement in surface finish and reduction in recast layer thickness with PMEDM. EDS analysis reported presence of tungsten and carbon in recast layer deposited on machined surface.

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A chronological survey demonstrating the cryptanalysis of RC4 stream cipher is presented in this paper. We have summarized the various weaknesses of RC4 algorithm followed by the recently proposed enhancements available in the literature. It is established that innovative research efforts are required to develop secure RC4 algorithm, which can remove the weaknesses of RC4, such as biased bytes, key collisions, and key recovery attacks on WPA. These flaws in RC4 are still offering an open challenge for developers. Hence our chronological survey corroborates the fact that even though researchers are working on RC4 stream cipher since last two decades, it still offers a plethora of research issues. The attraction of community towards RC4 is still alive.

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Earlier studies on cryogenic treatment highlighted that certain metals, after being cryogenically treated, show a significant increase in tool life when used in manufacturing, cutting and shaping processes. The present work deals with experimental investigation of the role of cryogenic treatment on the machining characteristics of titanium in electric discharge machining (EDM). EDM is a potential process to commercially machine tough materials like titanium alloys, due to the properties of non-mechanical contact between the tool and workpiece and the capability to machine intricate shapes. In this research work an effort has been made to compare the machining characteristics of titanium with EDM, before and after cryogenic treatment of the tool and workpiece using a Taguchi design approach. The output parameters for study are material removal rate (MRR), tool wear rate (TWR), surface roughness (SR) and dimensional accuracy (Δd). The results of the study suggest that with cryogenic treatment MRR, TWR, SR and Δd show an improvement of 60.39%, 58.77%, 7.99% and 80.00% respectively.

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