Learn about website security, HTML injection, cross-site scripting (XSS), and why inline styles are risky. See dangers, examples, prevention methods, .htaccess rules, PCI compliance, and how to test your site.

Mobile apps have become an essential extension of how people interact with products and services. Whether you’re booking a flight, paying for coffee, or managing your retirement portfolio, you’re likely doing it through a smartphone. That popularity brings significant security challenges, especially with estimates showing more than 255 billion mobile app downloads in 2023 alone. Each of those downloads represents a potential opportunity for attackers if security best practices are ignored.

Two-factor authentication (2FA) has become a cornerstone of online security. It provides an extra layer of protection by requiring users to verify their identity in two ways—typically, something they know (a password) and something they have (a code sent to their phone). But implementing 2FA effectively requires balancing security with user convenience. Here’s a look at when and why you should prompt for 2FA, with specific timing recommendations and examples, including how to implement checks using PHP.

In the past we posted PHP code to generate CAPTCHA, and here is a small fix to the code that will make it more secure.

In last article I explained what CAPTCHA is and why it is used (you can find that article here). Here I will provide PHP code that crates and uses CAPTCHA.