Security
Comprehensive content on server security, SSL/TLS, firewall, and DDoS protection.
12 articles
What Is a DDoS Attack and How Does It Work? Layered Protection Strategy
DDoS (Distributed Denial of Service) attacks aim to overwhelm a server or network with excessive traffic, rendering it unable to serve legitimate users. In 2025, the average DDoS attack volume exceeded 1.5 Tbps, and 65% of attacks lasted less than 10 minutes - making detection and response speed cri
WAF Setup: ModSecurity Integration with Nginx
A Web Application Firewall (WAF) is a security layer that protects your web applications against SQL injection, XSS, file inclusion, and other OWASP Top 10 attacks. ModSecurity is the most widely used open-source WAF engine and integrates with Nginx. This guide covers ModSecurity installation, OWASP
Managing Firewall Rules with iptables on Linux Server
iptables is a packet filtering tool that runs on the Linux kernel's netfilter framework. It lets you control all network traffic entering and leaving your server. A properly configured iptables ruleset blocks unauthorized access, slows brute force attacks, and ensures only necessary services are exp
SSL/TLS Certificate Types: DV, OV, EV and Wildcard Differences
SSL/TLS certificates encrypt communication between your website and visitors while verifying your site's identity. But not all certificates are equal: DV (Domain Validation) only confirms domain ownership, while EV (Extended Validation) performs comprehensive organization verification. This guide co
Isolating Your Cloud Infrastructure with VPC: Virtual Private Cloud Guide
VPC (Virtual Private Cloud) lets you create an isolated network segment in the cloud that belongs exclusively to you. Even on shared infrastructure, your traffic is completely separated from other customers. A properly configured VPC blocks unauthorized access, controls network traffic, and helps yo
Zero Trust Network Architecture: Implementation Guide for Cloud Environments
Traditional network security relies on the "castle and moat" model: everything outside is a threat, everything inside is trusted. But cloud environments, remote work, and microservice architectures have blurred this boundary. Zero Trust architecture eliminates this assumption: no user, device, or ne
Server Hardening Checklist: 20 Steps to Take After Installation
A freshly installed Linux server is not production-ready with its default configuration. According to CIS (Center for Internet Security) benchmarks, default installations contain dozens of security vulnerabilities. This checklist covers 20 critical steps you should apply to harden your server immedi
OWASP Top 10 2025: Most Common Security Vulnerabilities in Web Applications
OWASP (Open Web Application Security Project) Top 10 is a globally referenced standard that ranks the most critical security risks in web applications. This list defines the vulnerabilities that developers and security teams should prioritize. In this guide, we cover each risk with real-world exampl
Database Security: Access Control and Encryption for MySQL and PostgreSQL
Databases hold your application's most valuable asset - data. A database breach can lead to customer data leaks, financial loss, and reputation damage. Default installations of MySQL and PostgreSQL do not provide adequate security for production environments. This guide covers all layers of database
Free SSL with Let's Encrypt: Setting Up Automatic Renewal
Let's Encrypt is a certificate authority that provides free DV (Domain Validation) SSL/TLS certificates, aiming to make internet traffic encryption widespread. As of 2024, it is the world's largest certificate provider with over 300 million active certificates. Certificates are valid for 90 days, an
Secrets Management: Protecting API Keys and Passwords with Hashicorp Vault
Hardcoded API keys in application code, plaintext passwords in .env files, and shared credentials are among the most common security vulnerabilities. According to GitGuardian's 2024 report, over 10 million secret leaks are detected on GitHub annually. Hashicorp Vault enables you to centrally manage,
Server and Backup Strategies Against Ransomware Attacks
Ransomware attacks cause over $20 billion in global damage annually in 2025. Attackers encrypt your files and demand ransom for the decryption key. If you have no backups or your backups are also encrypted, your options are extremely limited. This guide covers prevention, detection, and recovery str