Web Applications Big trend:software as a(Web-based)service -Online banking,shopping,government,bill payment,tax prep,customer relationship management,etc. -Cloud computing Applications hosted on Web servers -Written in a mixture of PHP,Java,Perl,Python,C,ASP Security is rarely the main concern -Poorly written scripts with inadequate input validation -Sensitive data stored in world-readable files -Recent push from Visa and Mastercard to improve security of data management(PCI-Payment Card Industry standard) 22 Web Applications  Big trend: software as a (Web-based) service ─ Online banking, shopping, government, bill payment, tax prep, customer relationship management, etc. ─ Cloud computing  Applications hosted on Web servers ─ Written in a mixture of PHP, Java, Perl, Python, C, ASP  Security is rarely the main concern ─ Poorly written scripts with inadequate input validation ─ Sensitive data stored in world-readable files ─ Recent push from Visa and Mastercard to improve security of data management (PCI – Payment Card Industry standard)