Security - ITNotes

Mastering DMARC, SPF, and DKIM: Your Essential Email Security Configuration Guide

March 24, 2026

This comprehensive guide explores DMARC, SPF, and DKIM configuration, crucial for modern email security. Learn how to protect your domain from spoofing and phishing, dramatically improving deliverability and reputation through practical setup and advanced tips.

Security

Mastering OpenVAS/Greenbone: A Practical Guide to Vulnerability Management

March 24, 2026

After experiencing relentless SSH brute-force attacks, I recognized the critical need for proactive security. This guide introduces OpenVAS/Greenbone as a robust, open-source solution for comprehensive vulnerability management, covering practical setup, scanning, and report analysis to keep your systems secure.

Security

How to Protect Web Apps from XSS and CSRF Vulnerabilities: A Production Retrospective

March 23, 2026

After six months hardening a production web app against XSS and CSRF attacks, this guide covers what actually works: output encoding, nonce-based CSP, CSRF tokens, SameSite cookies, and security headers — with practical Python and Nginx code examples.

Security

Mastering Network Defense: Deploying Suricata IDS/IPS on Linux

March 20, 2026

Deploy Suricata IDS/IPS on Linux to safeguard your network from modern cyber threats. This tutorial guides you through installation, configuration, and advanced techniques for effective intrusion detection and prevention, ensuring robust network security.

Security

Boost Your Defenses: Security Monitoring with Wazuh (OSSEC Fork)

March 19, 2026

Secure your infrastructure with Wazuh, an open-source platform for security monitoring. This tutorial covers quick setup, a deep dive into features like FIM and log analysis, and advanced tips for customization and automation.

Security

Shadow AI: The Hidden Perils of Unsanctioned AI Tool Usage in Organizations

March 19, 2026

Shadow AI poses significant, unmanaged risks to organizations, from severe data leakage to critical compliance violations. Implementing clear policies, robust technical controls, and providing secure approved alternatives are crucial steps to manage the unauthorized use of AI tools and protect your sensitive information.

Security

Password Security: How to Generate Strong Passwords & Check Their Strength

March 18, 2026

Mastering password security is a fundamental skill for any IT professional. This guide walks you through generating strong, unique passwords with practical tools and effectively assessing their strength.

Security

Securing LLM-Powered Applications: OWASP Top 10 for LLMs Explained

March 15, 2026

The OWASP Top 10 for LLMs lists the ten most critical security risks for AI-powered applications. This guide walks through prompt injection, insecure output handling, sensitive data leaks, and excessive agency — with practical Python code you can apply immediately to harden your LLM-powered app.

Security

Self-Hosting AI Models Securely: A Practical Guide to Data Privacy

March 13, 2026

Worried about AI data privacy? Explore secure self-hosting options. This step-by-step guide empowers you to deploy AI models on your own servers, ensuring your sensitive data remains private and under your control.

Security

SSL/TLS Certificate Setup with Let’s Encrypt: A Production Guide

March 13, 2026

Web security is critical. This guide offers clear, practical steps to implement SSL/TLS certificates with Let's Encrypt, ensuring your web applications are secure and trusted. Learn about installation, configuration, and automatic renewal.