Catalog
concept#Security#Architecture#Governance#Platform

Security Architecture

A concept for the structural design of security capabilities in IT landscapes that defines principles, patterns and interfaces for protection measures.

Security architecture defines the structural placement of security capabilities across an IT estate.
Established
High

Classification

  • High
  • Technical
  • Architectural
  • Advanced

Technical context

Identity providers (e.g., LDAP, SSO)SIEM and observability platformsCloud provider security services

Principles & goals

Least Privilege: Grant minimal rights at role and service levels.Defense in Depth: Layered protections rather than single measures.Fail Secure: Systems should fail into a safe state on error.
Build
Enterprise, Domain

Use cases & scenarios

Compromises

  • Over-centralization of decisions can limit local agility.
  • Misconfigurations can result in ineffective protection.
  • Insufficient skills prevent correct implementation.
  • Design for auditability: plan logging and traceability from the start.
  • Combine defense-in-depth with least-privilege principles.
  • Conduct regular threat modelling workshops and architecture reviews.

I/O & resources

  • Asset inventory and data classification
  • Threat model and risk assessment
  • Existing operational and network architecture
  • Security architecture blueprint and policies
  • Implementation and migration plans
  • Monitoring and audit standards

Description

Security architecture defines the structural placement of security capabilities across an IT estate. It specifies principles, patterns, and interfaces for distributing controls, identity and access management, and monitoring across systems and infrastructure. The aim is consistent risk reduction and traceable, auditable protection controls.

✔

  • Consistent defenses across systems reduce attack surface.
  • Improved traceability and auditability of controls.
  • Better foundation for compliance and risk management.

✖

  • High initial effort for analysis and design.
  • Possible performance impact from additional controls.
  • Requires continuous maintenance against new threats.

  • Mean Time to Detect (MTTD)

    Average time to detect a security-relevant incident.

  • Mean Time to Remediate (MTTR)

    Average time to remediate an identified vulnerability or incident.

  • Percentage of compliant components

    Share of systems that meet current security standards and configurations.

Zero-trust rollout at a SaaS provider

Zoning, microsegmented networks and centralized identity management to minimize lateral movement.

Bank: consolidation of heterogeneous security controls

Standardized security layers and an audit pipeline to meet regulatory requirements.

Public agency: protecting critical infrastructure

Concepts for redundancy, monitoring and incident response with clear responsibilities.

1

Initial assessment: create asset inventory, data classification and threat model.

2

Define architecture principles, zoning and control objectives.

3

Pilot implementation in one domain and validation of controls.

4

Rollout, introduce monitoring and establish continuous improvement.

⚠️ Technical debt & bottlenecks

  • Legacy systems without modern authentication mechanisms.
  • Insufficiently automated configuration checks.
  • Outdated documentation of network and data flows.
Identity and access management complexityLegacy systems without modern interfacesOperational overhead for monitoring and maintenance
  • Using only VPN and firewall while neglecting application security.
  • Introducing controls without governance, causing inconsistencies.
  • Minimal logging that prevents forensic analysis.
  • Defining security goals that are hard to measure without clear metrics.
  • Introducing too many tools without central control.
  • Treating architecture as a one-time project instead of a continuous process.
Network and infrastructure security knowledgeExperience with identity and access managementThreat modelling and risk management competence
Regulatory requirements and complianceCurrent threat landscape and attack vectorsScalability and availability of infrastructure
  • • Limited budget for security projects
  • • Heterogeneous existing system landscape
  • • Shortage of skilled IT security personnel