Security guides, privacy best practices, and data protection
13 articles in this category
What the three dot-separated parts of a JWT actually contain, why anyone can read your token but not forge it, the alg:none and HS256/RS256 key-confusion attacks explained from scratch, why the localStorage-vs-cookie debate has no clean winner, and the exact claims you must validate before trusting a token.
Secrets 'hidden' in base64 are readable by anyone with a terminal. This post shows how 3 bytes really become 4 characters, where the 33% size inflation comes from, and what the trailing = signs mean. You'll also see why btoa() explodes on emoji, and when to reach for base64url, base32, or hex instead.
Choosing a password hashing algorithm in 2026 isn't obvious: bcrypt is still safe but no longer state-of-the-art, Argon2id is now the OWASP recommendation, scrypt is memory-hard but leapfrogged, and PBKDF2 is the FIPS-approved holdout. This guide walks through the four contenders with working parameters, migration strategies for switching algorithms without breaking auth, and the common mistakes that turn good algorithms into bad implementations.
Complete OSSEC implementation guide for Ubuntu covering installation, agent configuration, custom rules, SIEM integration, performance tuning, and enterprise deployment with comprehensive troubleshooting and best practices.
Comprehensive step-by-step guide to implementing ransomware-resistant backup strategies on Ubuntu 22.04 and 24.04, including rsync automation, LUKS encryption, cloud integration with Restic, systemd timers, and disaster recovery procedures.
Master Docker container security on Ubuntu with comprehensive daemon hardening, runtime threat detection, vulnerability scanning, network isolation, secrets management, and enterprise compliance. Includes CI/CD integration and troubleshooting.
Master Linux user management security with comprehensive sudo hardening, group-based access control, PAM configuration with multi-factor authentication, audit logging, and enterprise compliance. Includes container security and troubleshooting.
Complete guide to deploying ntopng and Suricata on Ubuntu for enterprise network security monitoring. Covers installation, integration, rule management, threat intelligence, performance tuning, and troubleshooting for comprehensive threat detection.
Master Ubuntu server backup security with comprehensive ransomware protection, immutable backups, air-gapped storage, filesystem snapshots, disaster recovery planning, and enterprise-grade monitoring. Includes cloud integration and troubleshooting.
Comprehensive step-by-step guide to installing and configuring Fail2ban on Ubuntu 22.04 and 24.04, including Python 3.12 compatibility fixes, SSH protection, web server security, custom jails, and advanced monitoring.
Complete guide to hardening Apache and Nginx on Ubuntu with SSL/TLS configuration, security headers, protection mechanisms, ModSecurity, fail2ban, and advanced monitoring for production environments.
Comprehensive step-by-step guide to hardening Ubuntu 24.04 LTS with SSH security, UFW firewall, fail2ban, AppArmor 4.0, kernel hardening, and advanced security measures for production servers.
Comprehensive step-by-step guide to mastering UFW firewall on Ubuntu systems, covering installation, basic rules, advanced features, Docker integration, security hardening, troubleshooting, and 2024-2025 security updates.