Analysis of an attribute-based encryption system for cloud data access
Abstract
There is a way to lower the Internet's common overhead and offer a fine-grained access control whenever cloud access control is being considered. These problems can be resolved with attribute-based encryption. A centralized attribute-based encryption scheme is suggested for the current system, in which users get secret keys and attributes from a single key distribution center.This paper suggests a decentralized attribute-based encryption system where any party can function as the authority by generating a public key and providing various users with private keys. Additionally supported by the suggested system are user revocation and anonymous authentication. The performance of decentralized Cipher-text attribute-based encryption and attribute-based encryption can also be compared.
Optimizing Activated Carbon from Eggplant Stems for Methyl Orange Removal: Impact of Activating Agent Concentration
Abstract
The objective of this study is to evaluate the influence of the activating agent concentration on the removal of methyl orange using activated carbons derived from eggplant stems. The activated carbons were prepared using the chemical activation process with orthophosphoric acid (H3PO4) at concentrations of 10% and 30%. The activation time and temperature were set at 3 hours and 400 °C, respectively. Various adsorption tests were conducted in a batch system by varying the time, carbon dose, pH, and the concentration of the dye solution. The activated carbons obtained through this process were labeled as CA10% and CA30%. The results of the adsorption kinetics indicate that the equilibrium time is 50 minutes and 70 minutes for CA30% and CA10%, respectively. Adsorption is therefore faster for the carbon produced with the higher concentration of the activating agent (H3PO4 30%). Furthermore, the kinetic modeling follows the pseudo-second-order model for both types of carbon. Additionally, the adsorption rate increases with the mass of activated carbon, and the optimal pH for dye removal is pH = 2. In conclusion, both types of activated carbon demonstrate good adsorption capacities for methyl orange, with more than 80% removal and a shorter equilibrium time for CA30%. These performances indicate the potential for valorizing agricultural waste, such as eggplant stems, into porous materials for dye removal from aqueous environments.