Higher College of Technology

About: Higher College of Technology is a based out in . It is known for research contribution in the topics: Computer science & Higher education. The organization has 369 authors who have published 379 publications receiving 729 citations.

ID-based key-insulated signcryption with equality test in cloud computing

Abstract: Key-insulated encryption reduces the problem of secret key exposure in hostile setting while signcryption cryptosystem attains the benefits of digitally signing a ciphertext and public key cryptosystem. In this study, we merge the primitives of parallel key-insulation cryptosystem and signcryption with equality test to construct ID-based parallel key-insulated signcryption with a test for equality (ID-PKSET) in cloud computing. The construction prevent data forgery, data re-play attacks and reduces the leakage of secret keys in harsh environments. Our scheme attains the security property of existential unforgeable chosen message attack (EUF-CMA) and indistinquishable identity chosen ciphertext attack (IND-ID-CCA2) using random oracle model.

Evaluation of the effect of Moringa peregrina bark on the crystal habit and size of calcium oxalate monohydrate crystals in different stages of crystallization using experimental and theoretical methods

Abstract: A significant proportion of the world's population is afflicted by kidney stone disease, urolithiasis, often as a chronic, recurring condition. The process of biomineralization leading to urolithiasis can be regulated by various inhibitory molecules. The extract of the bark of Moringa peregrina has been considered as a modulator of calcium oxalate monohydrate (COM), the primary constituent of urolithiasis. In this study, the inhibitory potential of the COM crystallization process by the extract is evidenced by turbidity studies while control of aggregation is explored by measurement of the zeta potential. Scanning electron microscopy of the crystals formed under various conditions points to inhibitor specificity at vulnerable points in the lattice. Molecular modelling of the interaction of selected phytochemicals found in the extract with a fragment carved out of the reported crystal structure of COM was carried out to substantiate the inhibitory mechanism.

A Comparative Analysis of Biodiesel Properties Derived from Meat Stall Wastes through Optimized Parameters

Abstract: Biodiesel is considered as alternative green fuels that can be used in Internal Combustion engines as a replacement fuel for conventional diesel. Biodiesel is extracted from vegetable and animal sources which are rich in triglycerides. In this work, an attempt has been made to obtain and characterize the biodiesel from animal wastes such as chicken skin and pig tallow which are available in abundance and at an economical cost within the authors’ geographical location. Initially, the feedstock is decontaminated and subjected to conventional heating to convert it into fatty oil. Heating is carried out at different temperatures and for varying time to find out the optimal combination of time and temperature, which would result in maximum fat yield. The fatty oil is then subjected to the trans-esterification process with methyl alcohol in the presence of a catalyst to extract crude biodiesel. A de-canter funnel is used to separate the glycerine and biodiesel from the crude extract. The extracted biodiesel is mixed in different volume percentages with conventional diesel, and various thermochemical properties were evaluated as per ASTM standards. The test result indicated that the properties of the biodiesel blends were well within the limits as prescribed by ASTM standards.