Cybersecurity Fundamentals Cheat Sheet

Cybersecurity is a critical field that requires a strong understanding of fundamental concepts, tools, and practices. Below is a comprehensive guide to essential cybersecurity principles, commands, and techniques.

You Should Know:

1. Basic Linux Commands for Cybersecurity

– `nmap -sV ` – Scan for open ports and services.
– `wireshark` – Analyze network traffic in real-time.
– `sudo apt update && sudo apt upgrade` – Update Linux system packages.
– `chmod 600 ` – Restrict file permissions to owner-only read/write.
– `grep “pattern” ` – Search for specific text in files.

2. Essential Windows Security Commands

– `netstat -ano` – List active connections and processes.
– `ipconfig /all` – Display network configuration details.
– `tasklist` – View running processes.
– `sfc /scannow` – Scan and repair system files.
– `gpupdate /force` – Force Group Policy updates.

3. Network Security Tools & Techniques

• Firewall Management:
• Linux: `sudo ufw enable` (Enable Uncomplicated Firewall).
• Windows: `netsh advfirewall set allprofiles state on` (Enable Windows Firewall).
• SSH Hardening:
• Edit `/etc/ssh/sshd_config` to disable root login (PermitRootLogin no).
• Password Security:
• Use `openssl rand -base64 12` to generate strong passwords.

4. Malware Analysis & Forensics

– `strings ` – Extract readable strings from a binary.
– `volatility -f pslist` – List processes in a memory dump.
– `clamscan -r /home` – Scan for viruses using ClamAV.

5. Encryption & Secure Communication

• GPG Encryption:
• Encrypt: `gpg -c `
• Decrypt: `gpg -d `
• SSL/TLS Inspection:
  – `openssl s_client -connect :443` – Check SSL certificate details.

What Undercode Say

Cybersecurity fundamentals are the backbone of protecting digital assets. Mastering these commands and techniques ensures a strong security posture. Regular updates, strict access controls, and continuous monitoring are key to mitigating threats.

Expected Output:

Active Internet connections (servers and established) 
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name 
tcp 0 0 0.0.0.0:22 0.0.0.0: LISTEN 1234/sshd 

(Note: No irrelevant URLs or social links were included as per the request.)

References:

Reported By: Alexrweyemamu Cybersecurity – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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