Security Architecture for a Cloud Migration

The company was moving critical business systems to the cloud but had built their security posture around a traditional perimeter model with firewalls and network-based controls.

Network security controls that worked on-premises did not translate directly to cloud environments. The security team lacked experience with cloud-native security services.

Leadership was concerned about maintaining security during migration and ensuring the cloud environment met the same standards as existing infrastructure.

We assessed current security controls and identified gaps for the cloud environment. Many existing controls relied on network perimeter assumptions that would not apply in AWS.

We designed cloud security architecture aligned with AWS Well-Architected Framework security pillar. This included VPC design, security group strategy, and IAM policy structure.

Identity-based access controls replaced network-perimeter assumptions. Resources are protected based on who is accessing them rather than where requests originate.

We configured cloud-native security services including GuardDuty for threat detection, Security Hub for centralized visibility, and Config Rules for continuous compliance checking.

We created runbooks for cloud-specific incident response covering common scenarios like compromised credentials, unauthorized resource creation, and data exfiltration attempts.