Irish International Journal of Engineering and Applied Sciences

This work focused on securing data transfer in an unsecured network between the client and the sever. Here, Computer Aided Software Engineering (CASE) and Object-Oriented Software Engineering (OOSE) methodological approaches were used in the design and development of the digital signature with RSA algorithm system. Java programming and Hypertext Preprocessor scripting languages were used in the development of the algorithms, while Hypertext Markup Language was used in the system deployment in NetBeans integrated development environment. The system modelling exploits the Entity-Relationship (E-R) model in establishing the objects relationships. MySQL and SQLite were deployed in creation of the database connection and objects through programming for easy querying of the database. Encryption and decryption test was carried out to verify the functionality of the proposed model using public and private keys. Result showed that the developed model successfully encrypted and decrypted credit card details sent across the network without error.

ABSTRACT: Abattoir waste discharged on soil is of great concern to the environmentalists. It has been adjudged to have negative impact on soil medium; hence the study analyzes the abattoir soil in Yenagoa metropolis.  The study made use of descriptive normative survey. Soil samples were taken from two different abattoir sites and a control site to assess the physico-chemical properties and heavy metal parameters of the soil. The soil parameter was determined using conventional analytical technique.  The soil pH (µS/cm) was found to be ranging from 4.61-6.24(µS/cm) for Swali study area and 6.35-5.88(µS/cm) for Etegwe study area. Electrical conductivity for Swali varied from 148.30 to 132.42(µS/cm) whereas for Etegwe it range from 99.40 to 162(µS/cm). Sulphate, nitrate, chloride and phosphate recorded 18. 70 mg/kg, 2.842 mg/kg, 62.00 mg/kg and 1.35 mg/kg, respectively and control site of 24.88 mg/kg, 0.37mg/kg, 21.80 mg/kg and 0.38 mg/kg, respectively in Swali while Etegwe abattoir site recorded the value for Sulphate, nitrate, chloride and phosphate as 24.65mg/kg, 3.73mg/kg,73.84mg/kg and 2.38mg/kg respectively and control site of 28.72 mg/kg, 2.18mg/kg , 42.70 mg/kg , and 0.54 mg/kg respectively. They were all within the WHO permissible limit for soil standards except electrical conductivity (ED) level of Swali abattoir study area with 148 (µS/cm)  which above WHO permissible limits.  The findings revealed that despite increasing abattoir activity in the study area, heavy metal levels in soils were typically low when compared to FEPA permissible limits. Zinc (Zn), Chromium (Cr), Copper (Cu), and Iron (Fe), 3.217mg/kg, 0.115mg/kg, 0.267mg/kg and 1.267mg/kg respectively in Swali sampled abattoir soil and 0.694mg/kg, 0.017mg/kg, 0.045mg/kg and 2.229mg/kg respectively in Etegwe sampled abattoir soil, showed negligible value. The study recommends that abattoirs should be properly designed with modern technologies that will incorporate adequate and comprehensive waste management techniques, the stakeholders should endeavor to be organizing on an annual basis, workshops and services and conferences on waste management for the operators of abattoirs in the area.