Security Basics
Implement Linux security best practices including user permissions, firewall configuration, SSH hardening, and system vulnerability protection.
Articles in Security Basics
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How to verify file checksums in Linux
Learn how to verify file checksums in Linux using MD5, SHA-1, and SHA-256. Complete guide with step-by-step examples, commands, and troubleshooting tips for beginners.
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How to create a GPG key in Linux
Learn how to create, manage, and use GPG keys in Linux for secure encryption and digital signatures. Complete guide with step-by-step instructions and examples.
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How to encrypt files in Linux
Learn how to encrypt files in Linux using gpg, openssl, and other tools. Complete guide with step-by-step instructions, examples, and troubleshooting tips.
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How to set up fail2ban in Linux
Learn how to install and configure fail2ban on Linux to protect your server from brute force attacks. Complete guide with examples and troubleshooting tips.
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How to change SSH port in Linux
Learn how to change SSH port in Linux for enhanced security. Step-by-step guide with examples, firewall configuration, and troubleshooting tips for beginners.
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How to secure SSH on Linux
Learn how to secure SSH on Linux with comprehensive step-by-step guide. Implement key-based authentication, disable root login, configure firewalls, and more.
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How to configure a firewall in Linux
Learn how to configure Linux firewalls with iptables and UFW. Step-by-step guide covering installation, rules, port management, and troubleshooting for beginners.
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How to disable root login in Linux
Learn how to disable root login in Linux for enhanced security. Step-by-step guide covering SSH, console access, and best practices for system administrators.
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How to create a sudo user in Linux
Learn how to create a sudo user in Linux with step-by-step instructions. Complete guide covering Ubuntu, CentOS, and Debian with examples and troubleshooting tips.
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How to update Linux for security
Learn how to update Linux for security with comprehensive guides for Ubuntu, CentOS, and other distributions. Keep your system protected with proper update practices.