Cloud Security Compliance for Financial Services in India

Cloud providers operate on a shared responsibility model where they secure the infrastructure, and you secure your workloads, data, and access. The division depends on the service model. In IaaS, you are responsible for the operating system, applications, data, and network configuration. The provider manages the hypervisor, physical infrastructure, and physical security. In PaaS, the provider additionally manages the operating system and runtime, but you remain responsible for applications and data. In SaaS, you are primarily responsible for access management and data protection. The practical implication for compliance is that migrating to cloud does not transfer your compliance obligations to the provider. If you process cardholder data in an AWS EC2 instance, you are responsible for hardening the operating system, configuring the firewall, implementing intrusion detection, managing encryption, and maintaining access controls. AWS is responsible for the physical security of the data center, the hypervisor layer, and the availability of the compute service. Many financial institutions misunderstand this model and assume that using a PCI DSS-certified cloud provider makes their deployment PCI DSS compliant. It does not. The provider's compliance covers their layer of the stack - everything above that is your responsibility. Obtain your cloud provider's PCI DSS Attestation of Compliance and their shared responsibility matrix. Map each PCI DSS requirement to either the provider's responsibility, your responsibility, or shared responsibility. This mapping is essential for your own PCI DSS assessment.

RBI's data localization directive requires that the full end-to-end transaction data for payment transactions involving India must be stored in systems located in India. This includes the entire payment transaction chain - from transaction initiation to settlement. If you use cloud infrastructure for payment processing, your compute and storage resources must be deployed in Indian cloud regions. All three major cloud providers - AWS, Azure, and Google Cloud - have regions in India. However, data localization goes beyond just choosing an Indian region. Verify that your data does not transit through non-Indian regions during processing. Some cloud services route traffic through global load balancers or edge nodes that may be located outside India. Ensure that backup, disaster recovery, and log storage also reside in Indian regions. For DPDP compliance, the cross-border transfer framework is different. DPDP permits transfer to countries not on the restricted list but requires appropriate contractual safeguards. This means your cloud provider contracts must address data residency, processing restrictions, and the right to audit. The practical challenge is implementing these requirements across multi-cloud and hybrid environments. Organizations with workloads spanning multiple clouds and on-premises infrastructure need a consistent data governance framework that tracks where data resides across all environments and enforces location-based policies automatically.

Start with network architecture. Implement network segmentation in the cloud using Virtual Private Clouds, subnets, security groups, and network ACLs. For PCI DSS compliance, the cardholder data environment must be segmented from non-CDE workloads. In cloud environments, this means separate VPCs or virtual networks for the CDE, with tightly controlled traffic flow between segments. Implement centralized logging and monitoring. Cloud environments generate enormous volumes of logs - cloud provider activity logs, operating system logs, application logs, and network flow logs. Centralize these in a SIEM or security analytics platform and build detection rules for common attack patterns. For PCI DSS Requirement 10, ensure that all access to cardholder data in the cloud is logged with sufficient detail for forensic investigation. Implement identity and access management with the principle of least privilege. Use cloud-native IAM services to enforce granular access controls. Implement MFA for all administrative access. Avoid long-lived access keys - use temporary credentials through role assumption wherever possible. For PCI DSS Requirement 7 and 8, document your access control model and evidence how least privilege is enforced. Implement encryption at rest and in transit for all sensitive data. Use cloud-native encryption services with customer-managed keys for maximum control. For PCI DSS Requirement 3, ensure that primary account numbers are encrypted with keys that you manage, not shared keys managed by the cloud provider. For Requirement 4, enforce TLS 1.2 or higher for all data in transit.