Cybersecurity Fundamentals: Network Defense, Cryptography, OWASP Top 10 & Incident Response

Build a rock-solid engineering foundation in defensive cybersecurity—from analyzing raw TCP/IP packets in Wireshark and configuring TLS 1.3 cryptography to locking down Linux servers, preventing OWASP Top 10 exploits, and leading NIST incident response.

Every modern organization runs on cloud infrastructure, web APIs, and distributed networks—yet most software developers, IT administrators, and aspiring security analysts only learn isolated security tips without understanding how attacks actually work across the stack. Cybersecurity Fundamentals: Network Defense, Cryptography, OWASP Top 10 & Incident Response is an exhaustive, 11-module defensive security curriculum that bridges theoretical computer science and hands-on Blue Team operations.

Why Stack-Wide Security Literacy Is Essential

Attackers do not stay inside a single syllabus box: an intrusion might begin with a phishing credential or an unpatched web vulnerability (SQL Injection, SSRF, or Broken Access Control), pivot across the local subnet using misconfigured network rules, escalate privileges via a weak Linux permission or SSH config, and exfiltrate data unless stopped by Zero Trust identity controls and Security Operations Center (SOC) telemetry. This course equips you to understand—and defend—every layer of that chain.

What Makes This 11-Module Cybersecurity Course Different?

• 11 Deep Technical Modules · 39 Lectures (7.7 Total Hours): Combines authoritative security lectures from IBM Technology, Computerphile, NetworkChuck, HackerSploit, OktaDev, Fireship, and CrashCourse with 14 comprehensive defensive engineering manuals.
• Downloadable Cybersecurity & Incident Response Playbook Included: Download the Crestily Cybersecurity Fundamentals Playbook containing your STRIDE Threat Modeling matrix, Cryptography algorithm selection table, Linux/SSH hardening checklist, OWASP Top 10 remediation guide, and NIST SP 800-61 Incident Response runbook.
• 10 Module Quizzes + 30-Question Final Certification Exam: Every module concludes with a 6-question scenario-based security quiz (60 module quiz questions total), culminating in our largest 30-question Final Certification Exam in Module 11.
• Built-In 24/7 AI Security Architect (Cressa) & Verified Certificate: Ask Cressa to explain Wireshark filters, audit a SQL query for injection flaws, or review a Content-Security-Policy header—and pass the Final Exam (75% required) to earn your Crestily Verified Certificate.

Complete 11-Module Curriculum Breakdown

• Module 1 — The CIA Triad, Threat Modeling (STRIDE), Attack Surfaces & Defense-in-Depth: Master Confidentiality, Integrity, Availability, Non-Repudiation, Least Privilege, and Microsoft's STRIDE threat modeling framework.
• Module 2 — TCP/IP & OSI Networking, DNS, Subnets & Packet Analysis with Wireshark: Trace the 7-layer OSI model, TCP 3-way handshakes, SYN floods, ARP spoofing, DNSSEC, and live Wireshark display filters.
• Module 3 — Applied Cryptography: Hashing, Argon2id, Symmetric AES-GCM & Asymmetric ECC/RSA: Understand entropy, salted password hashing, authenticated encryption (AEAD), Diffie-Hellman key exchange, and digital signatures.
• Module 4 — Public Key Infrastructure (PKI), X.509 Certificates, TLS 1.3 & mTLS: Inspect Certificate Authorities, the TLS 1.3 1-RTT handshake, Forward Secrecy, HSTS, Certificate Transparency, and mutual TLS (mTLS).
• Module 5 — Linux OS Hardening, POSIX Permissions, SSH Keys & Host Firewalls: Lock down Linux servers using chmod/SUID audits, key-only SSH (sshd_config), ufw/nftables, and unattended security patching.
• Module 6 — Network Perimeter Defense: Stateful Firewalls, IDS/IPS, VPNs, WAFs & DDoS Mitigation: Architect DMZs, VLAN segmentation, Suricata/Snort IDS vs. inline IPS, WireGuard VPNs, and Layer-3/4/7 DDoS defenses.
• Module 7 — Web Application Security & The OWASP Top 10:Remediate Broken Access Control (IDOR/BOLA), Security Misconfigurations, Vulnerable Dependencies (SBOM), and Server-Side Request Forgery (SSRF).
• Module 8 — Injection Vulnerabilities & Client-Side Attacks (SQLi, XSS, CSRF & CSP): Eliminate SQL Injection with parameterized queries, stop Stored/Reflected/DOM XSS, enforce HttpOnly/SameSite cookies, and deploy Content-Security-Policy (CSP).
• Module 9 — Identity & Access Management (IAM): MFA/Passkeys, OAuth 2.0, OIDC, JWTs & RBAC/ABAC: Implement Authorization Code + PKCE flows, validate JWT signatures/claims safely, and enforce FIDO2/WebAuthn phishing-resistant MFA.
• Module 10 — Zero Trust Architecture, SIEM Log Correlation, MITRE ATT&CK & NIST Incident Response: Map adversary TTPs with MITRE ATT&CK, triage SIEM alerts, execute the 6-phase NIST Incident Response lifecycle, and download your Playbook.
• Module 11 — Final Certification Exam (Verified Cybersecurity & Network Defense Specialist): Synthesize all 10 defensive domains and pass the 30-question Final Certification Exam (75% required) to claim your Verified Certificate.