In this research, we aggregated students log data such as Class Test Score (CTS), Assignment Completed (ASC), Class Lab Work (CLW) and Class Attendance (CATT) from the Department of Mathematics, Computer Science Unit, Usmanu Danfodiyo University, Sokoto, Nigeria. Similarly, we employed data mining techniques such as ID3 & J48 Decision Tree Algorithms to analyze these data. We compared these algorithms on 239 classification instances. The experimental results show that the J48 algorithm has higher accuracy in the classification task compared to the ID3 algorithm. The important feature attributes such as Information Gain and Gain Ratio feature evaluators were also compared. Both the methods applied were able to rank search method and the experimental results confirmed that the two methods derived the same set of attributes with a slight deviation in the ranking. From the results analyzed, we discovered that 67.36 percent failed the course titled Introduction to Computer Programming, while 32.64 percent passed the course. Since the CATT has the highest gain value from our analysis; we concluded that it is largely responsible for the success or failure of the students.
People are transferring large amount of data that are critical and consume large amount of time through the Internet such as email, banking transaction and online purchase. But due to high exposure they are susceptible to being heavily attacked or become attractive targets for attackers. This can be solved by using a modern phenomenon called symmetric encryption. Symmetric encryption is used to ensure that information is hidden from anyone for whom it is not intended. This research conducted a performance evaluation of symmetric data encryption algorithms namely Advanced Encryption Standard (AES) and Blowfish. The evaluation is done for four different data types: image data type, audio data types, video data types and textual file data types. The performance evaluation metrics are encryption time and throughput. The prototype is developed using JAVA, compiled using the Netbeans IDE7.1.2 with default settings in jdk 7.1 development kit. Results obtained from this evaluation indicated that blowfish is more efficient than AES. But for Blowfish the encryption time sometime decreases with the increase in data size. This can be attributed to the fact that Blowfish uses 126, 192 or 256 key sizes.
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