Attribute-Based Encryption (ABE) can provide a technique of fine-grained control. The suggested Enhanced CP-ABE technique includes the use of a proxy to securely communicate the key to users. The Rivest Shamir Adleman (RSA) Algorithm secures outsourced big data in the cloud by allowing public key encryption to safeguard data transported across an unsecured network like the internet. During decryption, the proposed RSA CP-ABE with Access tree structure for Secure Revocable scheme for Building Trust model successfully identifies the users who decrypt the cipher messages. For Third Party auditing, the Dynamic Attribute Tree approach is proposed to encrypt data based on its attribute. The attributes, together with data and keys, are stored in a tree structure, which aids in improving the dynamic update of data in the cloud. Bilinear mapping is used by the Dynamic Attribute Tree approach to validate the integrity of the data without having to retrieve it from the cloud. The experimental results reveal that for a 256-bit key length, the proposed Scheme achieves encryption and decryption times of 1638 ms and 1102 ms, respectively.

ICT has led to innovations in various sectors of the economy, including cooperative societies. As a result of innovation, several cooperative systems have been developed, but they do not adequately and effectively meet the needs of various cooperative societies. In addition, their process framework does not embed a generic approach such that the peculiarities of different cooperative can be catered for. Therefore, this paper presents a generic systems process framework for the development of cooperative system using Goal-driven Development Process (GDP). The GDP draws from the principle of an iterative and incremental model with top-down and bottom-up convergence approach for the identification of goals and implementation. HTML and CSS was used to implement the front-end while the back end was implemented using PHP and MySQL. The system was evaluated by 24 stakeholders across 4 cooperative societies. The result showed 71.67% overall reaction to the software, 73.54% screen, 68.13% terminology, and system information, 67.01% learning, and 71.5% system capability with overall evaluation of approximately 70.4% user’s satisfaction. Thus, the research presents a generic process framework that adequately captures the peculiarities of cooperative societies that software engineers will find useful in the development of cooperative software irrespective of the size and the complexity.

This paper illustrates the hypothetical study conducted when using quarry dust (QD) and sludge in producing 225mm x 225mm x 450mm hollow sandcrete blocks. QD and wastewater treatment sludge (WWTS) were used to replace river sand at 10%, 20% and 30%. Proportions of 50%QD:50%WWTS and 75%QD:25%WWTS were considered for a standard cement to sand combination of 1:6. Water-cement ratio (w/c) was increased as the percentage replacement increased. Specimens were produced and cured via sprinkling for 28 days. They were subjected to compression and water absorption tests. Mix A2 having 75%QD:25%WWTS at 0.55 w/c and 10% sand replacement had the highest compressive strength and water absorption values of 3.69N/mm2 and 6.22% accordingly. These results exceeded the NIS 87:2000 recommendation of 3.45N/mm2 for 225mm load bearing blocks and 12.61% by ASTM C140 respectively. Therefore, QD and WWTS in right proportions can substitute river sand in producing load bearing sandcrete hollow blocks.