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If you’re diving into the world of cybersecurity or looking to strengthen your Linux skills, “Linux Basics for Hackers” is a book you shouldn’t miss. This entry-level guide is packed with practical insights and tricks that even seasoned professionals can learn from. Whether you’re a beginner or someone revisiting the basics, this book offers a solid foundation in Linux, which is essential for pentesting and cybersecurity.
You Should Know:
Here are some essential Linux commands and practices related to cybersecurity that you should be familiar with:
1. Network Scanning with Nmap
Nmap is a powerful tool for network discovery and security auditing.
nmap -sP 192.168.1.0/24 # Ping scan to discover live hosts nmap -sV 192.168.1.1 # Version detection nmap -A 192.168.1.1 # Aggressive scan (OS detection, version detection, script scanning, and traceroute)
2. File Permissions and Ownership
Understanding file permissions is crucial for securing your system.
chmod 600 file.txt # Set read and write permissions for the owner only chown user:group file.txt # Change file ownership
3. Monitoring Logs
Logs are a goldmine for detecting suspicious activities.
tail -f /var/log/auth.log # Monitor authentication logs in real-time grep "Failed" /var/log/auth.log # Search for failed login attempts
4. Firewall Configuration with UFW
UFW (Uncomplicated Firewall) simplifies firewall management.
ufw enable # Enable the firewall ufw allow 22/tcp # Allow SSH traffic ufw deny 80/tcp # Block HTTP traffic
5. Password Cracking with John the Ripper
A tool for testing password strength.
john --wordlist=passwords.txt hashfile # Use a wordlist to crack passwords
6. File Integrity Checking
Ensure files haven’t been tampered with.
md5sum file.txt # Generate an MD5 checksum sha256sum file.txt # Generate a SHA-256 checksum
7. SSH Hardening
Secure your SSH server by editing the configuration file.
sudo nano /etc/ssh/sshd_config <h1>Disable root login and change the default port</h1> PermitRootLogin no Port 2222
8. Process Management
Monitor and manage running processes.
ps aux | grep ssh # Find SSH processes kill -9 PID # Terminate a process by its PID
9. Encryption with GPG
Encrypt files for secure communication.
gpg -c file.txt # Encrypt a file gpg -d file.txt.gpg # Decrypt a file
10. Disk Usage Analysis
Keep an eye on disk usage to prevent storage issues.
df -h # Display disk space usage du -sh /var/log # Check directory size
What Undercode Say:
Mastering Linux is a cornerstone of cybersecurity. The commands and practices listed above are just the tip of the iceberg. Tools like Nmap, UFW, and John the Ripper are indispensable for network security, while understanding file permissions, logs, and encryption ensures system integrity. Continuously revisiting the basics, as highlighted in “Linux Basics for Hackers,” reinforces your knowledge and uncovers gaps in your understanding. Keep experimenting, stay curious, and never stop learning.
For further reading, check out the book here: Linux Basics for Hackers.
References:
Reported By: Activity 7302822206823153664 – Hackers Feeds
Extra Hub: Undercode MoN
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