Title	A Secure and Robust Mobile Payment System
Author	Abdullah Fahad Althumairy, Mohammed Al Shehri and Shaik Shakeel Ahamad
Citation	Vol. 20  No. 4  pp. 51-54
Keywords	Secure Mobile Payments, Key Management, confidentiality, authentication, Integrity, Replay attacks, impersonation attacks and Man-In-The-Middle attack

Title	Smart Secure and Energy Efficient Scheme for E-Health Applications using IoT: A Review
Author	Mamoona Humayun NZ Jhanjhi Malak Z Alamri
Citation	Vol. 20  No. 4  pp. 55-74
Keywords	Security Efficiency Healthcare IoT Sensors Energy-efficiency Base Station

Title	Investigation of the different Influences of Software Usability Quality Evaluation for Systems at Umm Al-Qura University
Author	Abdullah A H Alzahrani
Citation	Vol. 20  No. 4  pp. 75-83
Keywords	software engineering, software quality attributes, SUS, usability evaluations.

Title	Optimizing Training Data Selection for Decision Trees using Genetic Algorithms
Author	Ahmad Alhindi
Citation	Vol. 20  No. 4  pp. 84-90
Keywords	Genetic Algorithm (GA) Machine Learning (ML) Supervised Learning Optimization Training Set Selection Data Mining Pattern Recognition.