About This Page

This page covers enterprise-level security architecture — how to design, build, and operate secure systems at scale. See Cybersecurity for foundational concepts and Ethical Hacking Advanced for offensive security. This is experimental page for Design.

Security Architecture Fundamentals

What is Security Architecture?

• The discipline of designing systems that are secure by design — not bolted on afterward.
• Combines: risk management, technical controls, policies, and people.

• Goal: protect CIA (Confidentiality, Integrity, Availability) across all layers.

graph TD
  RISK["Risk Management<br/>Identify · Assess · Treat · Monitor"]
  POLICY["Security Policy<br/>Governance · Standards · Procedures"]
  ARCH["Technical Architecture<br/>Network · Identity · Data · App · Endpoint"]
  OPS["Security Operations<br/>SOC · IR · Threat Hunting · Patching"]
  AUDIT["Audit & Compliance<br/>ISO 27001 · PCI DSS · GDPR · HIPAA"]
  RISK --> POLICY --> ARCH --> OPS --> AUDIT --> RISK

Security Architecture Domains

Risk Management Framework

graph LR
   ID["Identify Assets<br/>What are we protecting?"]
   THREAT["Identify Threats<br/>What could go wrong?"]
   VULN["Identify Vulnerabilities<br/>What weaknesses exist?"]
   RISK["Calculate Risk<br/>Likelihood × Impact"]
   TREAT["Treat Risk<br/>Accept · Mitigate · Transfer · Avoid"]
   MONITOR["Monitor<br/>Continuous reassessment"]
   ID --> THREAT --> VULN --> RISK --> TREAT --> MONITOR --> ID

Zero Trust Architecture (Deep Dive)

Zero Trust Principles

graph TD
   subgraph ZT["Zero Trust Architecture"]
   
       ID["Identity<br/>Verify every user<br/>MFA · Passwordless · PAM"]
       DEV["Device<br/>Verify device health<br/>MDM · EDR · Compliance"]
       NET["Network<br/>Micro-segmentation<br/>Encrypt all traffic<br/>ZTNA replaces VPN"]
       APP["Application<br/>Per-app access control<br/>App-level auth<br/>API security"]
       DATA["Data<br/>Classify + protect<br/>DLP · Encryption<br/>Data governance"]
   end
   POLICY["Policy Engine<br/>Continuous evaluation<br/>Context-aware decisions"]
   ID & DEV & NET & APP & DATA --> POLICY

Zero Trust vs Traditional Perimeter

Implementing Zero Trust

graph LR
   P1["Phase 1 — Visualize<br/>Inventory all assets<br/>Map data flows<br/>Identify trust boundaries"]
   P2["Phase 2 — Mitigate<br/>MFA everywhere<br/>Least privilege<br/>Micro-segmentation"]
   P3["Phase 3 — Optimize<br/>Continuous monitoring<br/>Automated response<br/>User behavior analytics"]
   P1 --> P2 --> P3

Network Security Architecture

Enterprise Network Design

graph TD
   INET["🌐 Internet"]
   DDOS["DDoS Protection<br/>Cloudflare · AWS Shield · Akamai"]
   FW1["Next-Gen Firewall<br/>Palo Alto · Fortinet · Check Point"]
   DMZ["DMZ<br/>Web servers · Reverse proxies<br/>Email gateway · DNS"]
   FW2["Internal Firewall<br/>Segment internal zones"]
   CORP["Corporate LAN<br/>User workstations"]
   SERVER["Server Zone<br/>App servers · Databases"]
   MGMT["Management Zone<br/>Jump servers · PAM<br/>Monitoring · SIEM"]
   OT["OT/IoT Zone<br/>Isolated from IT network"]
   INET --> DDOS --> FW1 --> DMZ --> FW2
   FW2 --> CORP & SERVER & MGMT & OT

Firewall Architecture

IDS vs IPS

VPN vs ZTNA

DNS Security Architecture

graph LR
   CLIENT["Client DNS Query"]
   FILTER["DNS Filtering<br/>Cisco Umbrella · Cloudflare Gateway<br/>Block malicious domains"]
   DNSSEC["DNSSEC Validation<br/>Verify DNS record signatures"]
   DOH["DNS over HTTPS/TLS<br/>Encrypt DNS queries"]
   RESP["DNS Response"]
   CLIENT --> FILTER --> DNSSEC --> DOH --> RESP

Identity Architecture

IAM Architecture

graph TD
   USER["👤 User / Service / Device"]
   IDP["Identity Provider<br/>Azure AD · Okta · Ping<br/>Google Workspace"]
   MFA["MFA Layer<br/>TOTP · FIDO2 · Push"]
   SSO["SSO / Federation<br/>SAML · OIDC · OAuth 2.0"]
   AUTHZ["Authorization<br/>RBAC · ABAC · PBAC"]
   PAM["PAM<br/>Privileged Access<br/>CyberArk · BeyondTrust"]
   APP["Applications<br/>SaaS · On-prem · APIs"]
   USER --> IDP --> MFA --> SSO --> AUTHZ --> APP
   AUTHZ --> PAM --> APP

Privileged Access Management (PAM)

Directory Services

Cloud Security Architecture

Cloud Security Reference Architecture

graph TD
   subgraph CLOUD["☁️ Cloud Environment"]
       CSPM["CSPM<br/>Cloud Security Posture Management<br/>Misconfig detection"]
       CWPP["CWPP<br/>Cloud Workload Protection<br/>Runtime security"]
       CASB["CASB<br/>Cloud Access Security Broker<br/>SaaS visibility + control"]
       CIEM["CIEM<br/>Cloud Infrastructure Entitlement<br/>IAM risk management"]
   end
   subgraph DETECT["Detection & Response"]
       SIEM["SIEM<br/>Log aggregation + correlation"]
       SOAR["SOAR<br/>Automated response playbooks"]
       XDR["XDR<br/>Extended Detection & Response"]
   end
   CLOUD --> DETECT

AWS Security Architecture

graph TD
   ACCOUNT["AWS Account<br/>Root account (MFA + no daily use)"]
   ORG["AWS Organizations<br/>Multi-account strategy<br/>SCPs (Service Control Policies)"]
   IAM["IAM<br/>Least privilege roles<br/>No long-term access keys<br/>IAM Access Analyzer"]
   VPC["VPC Architecture<br/>Public subnet (ALB, NAT)<br/>Private subnet (EC2, RDS)<br/>Security Groups + NACLs"]
   DETECT["Detection<br/>GuardDuty · Security Hub<br/>CloudTrail · Config · Macie"]
   PROTECT["Protection<br/>WAF · Shield · KMS<br/>Secrets Manager · Inspector"]
   ACCOUNT --> ORG --> IAM & VPC & DETECT & PROTECT

Multi-Account Strategy

Container Security Architecture

graph LR
   CODE["Source Code<br/>SAST · Secret scanning<br/>git-secrets · Semgrep"]
   BUILD["Container Build<br/>Image scanning<br/>Trivy · Snyk · Grype"]
   REGISTRY["Container Registry<br/>Signed images<br/>Vulnerability scanning<br/>ECR · ACR · GCR"]
   DEPLOY["Kubernetes Deploy<br/>Admission controllers<br/>OPA/Gatekeeper · Kyverno<br/>Pod Security Standards"]
   RUNTIME["Runtime Protection<br/>Falco · Aqua · Sysdig<br/>Network policies"]
   CODE --> BUILD --> REGISTRY --> DEPLOY --> RUNTIME

SIEM & Security Operations

SIEM Architecture

graph LR
   subgraph SOURCES["Log Sources"]
       FW["Firewalls"]
       EP["Endpoints<br/>EDR agents"]
       APP["Applications<br/>Web · DB · Auth"]
       CLOUD["Cloud<br/>AWS · Azure · GCP"]
       NET["Network<br/>Flow data · DNS · DHCP"]
   end
   COLLECT["Log Collection<br/>Syslog · Beats · Fluentd<br/>API connectors"]
   PARSE["Parsing & Normalization<br/>CEF · LEEF · ECS format"]
   ENRICH["Enrichment<br/>Threat intel · GeoIP<br/>Asset context"]
   CORRELATE["Correlation Engine<br/>Detection rules<br/>ML anomaly detection"]
   ALERT["Alerting<br/>SOC dashboard<br/>Ticketing (JIRA, ServiceNow)"]
   SOURCES --> COLLECT --> PARSE --> ENRICH --> CORRELATE --> ALERT

Detection Engineering

title: Suspicious PowerShell Encoded Command
status: stable
description: Detects PowerShell with encoded command parameter
logsource:
   category: process_creation
   product: windows
detection:
   selection:
       Image|endswith: '\powershell.exe'
       CommandLine|contains:
           - '-EncodedCommand'
           - '-enc '
           - '-ec '
   condition: selection
falsepositives:
   - Legitimate admin scripts using encoded commands
level: medium
tags:
   - attack.execution
   - attack.t1059.001

Key Detection Use Cases

SOAR Playbooks

graph LR
   ALERT["🚨 SIEM Alert<br/>Phishing email detected"]
   ENRICH["Enrich<br/>Check sender reputation<br/>Analyze URLs/attachments<br/>VT · URLScan · Hybrid Analysis"]
   DECIDE{"Malicious?"}
   CONTAIN["Contain<br/>Block sender domain<br/>Quarantine email<br/>Isolate endpoint if clicked"]
   NOTIFY["Notify<br/>Create ticket<br/>Alert SOC analyst<br/>Notify user"]
   CLOSE["Close<br/>Document findings<br/>Update blocklists<br/>Tune detection rule"]
   ALERT --> ENRICH --> DECIDE
   DECIDE -->|Yes| CONTAIN --> NOTIFY --> CLOSE
   DECIDE -->|No| CLOSE

DevSecOps Architecture

Secure CI/CD Pipeline

graph LR
   CODE["💻 Code<br/>IDE security plugins<br/>Pre-commit hooks<br/>git-secrets"]
   PR["Pull Request<br/>Code review<br/>SAST scan<br/>Secret detection"]
   BUILD["Build<br/>Dependency scan (SCA)<br/>Container image scan<br/>License compliance"]
   TEST["Test<br/>DAST scan<br/>Pentest (scheduled)<br/>Fuzz testing"]
   STAGE["Staging<br/>IAC security scan<br/>Compliance check<br/>Penetration test"]
   PROD["Production<br/>Runtime protection<br/>Monitoring + alerting<br/>Patch management"]
   CODE --> PR --> BUILD --> TEST --> STAGE --> PROD

Security Tools by Pipeline Stage

Infrastructure as Code Security

# Terraform security scanning
checkov -d ./terraform/                 # scan Terraform files
tfsec ./terraform/                      # Terraform security scanner
terrascan scan -t terraform             # policy-as-code scanner
 
# Kubernetes manifest scanning
checkov -d ./k8s/                       # scan K8s manifests
kubesec scan deployment.yaml            # K8s security risk analysis
kube-score score deployment.yaml        # best practice check
 
# Docker security
hadolint Dockerfile                     # Dockerfile linting
trivy image myapp:latest                # container image CVE scan
docker scout cves myapp:latest          # Docker Scout scanning

Compliance & Governance

Major Compliance Frameworks

Security Policy Hierarchy

graph TD
   POL["Policy<br/>High-level management intent<br/>'All data must be encrypted'"]
   STD["Standard<br/>Specific requirements<br/>'Use AES-256 for data at rest'"]
   PROC["Procedure<br/>Step-by-step instructions<br/>'How to enable disk encryption'"]
   GUIDE["Guideline<br/>Recommended practices<br/>'Consider using LUKS on Linux'"]
   POL --> STD --> PROC --> GUIDE

More Learn

Github & Webs

• NIST Cybersecurity Framework
• CIS Controls
• MITRE ATT&CK
• OWASP
• AWS Security Best Practices
• Azure Security Documentation
• Google Cloud Security
• Sigma Rules
• Cybersecurity — foundational concepts
• Ethical Hacking Advanced — offensive security
• Linux Advanced — Linux internals and hardening

Master Playlists YouTube

• Enterprise Security Architecture – SANS
• Zero Trust Architecture – Microsoft
• Cloud Security Architecture – AWS re:Inforce