# BSI C5 PI-03 — Secure deletion of data

- Source: https://support.icompaas.com/support/solutions/articles/a_gen_bsic5_pi03_fb353352e2-bsi-c5-pi-03-secure-deletion-of-data
- Section: [Solutions](https://support.icompaas.com/support/solutions) › [BSI C5 (German Cloud)](https://support.icompaas.com/support/solutions/c_gen_bsi_c5) › [Data Processing Interfaces](https://support.icompaas.com/support/solutions/folders/f_gen_cgenbsic5_dataprocessinginterfaces)
- Last updated: 2026-05-30
- Publisher: iCompaas, Inc. (https://www.icompaas.com)

BSI C5 · Control PI-03 · Priority: critical · Component: Data Processing Interfaces

### What this control covers

Ensures permanent deletion of customer data, metadata, and backups upon contract termination per PI-02 agreements. Uses forensic-resistant methods to prevent data recovery, protecting cloud customer data confidentiality post-service.

### Why it matters

A well-architected cloud landing zone bakes most of these controls in at the platform layer — done well, individual workloads inherit security for free.

### How to implement

#### AWS

Segment workloads into separate **VPCs/accounts per environment**. Use **security groups** as stateful allow-lists (least-port, source by SG ID not 0.0.0.0/0) and **VPC Flow Logs** to CloudWatch/S3. Front public services with **AWS WAF + Shield Advanced** and use **PrivateLink/VPC Endpoints** to keep service traffic off the internet.

#### Azure

Use **Network Security Groups** and **Application Security Groups** for east-west, and an **Azure Firewall** or NVA in a hub VNet for north-south. Enforce **Private Endpoints** for PaaS and turn on **Defender for Cloud — Network** for adaptive hardening recommendations.

#### GCP

Use **VPC Service Controls** to draw a perimeter around sensitive APIs and a hierarchical **Firewall policy** at the org/folder level so projects inherit a deny-by-default posture. Front HTTP workloads with the global **Cloud Load Balancer + Cloud Armor**.

#### Google Workspace

**Google Vault** retention rules cover Gmail/Drive/Chat; combine with periodic third-party backups (e.g., Spanning, Backupify) for full restore-by-user.

### Evidence to collect

-   `infra_scan` — See the iCompaas Evidence library for the canonical source for this evidence type.

Infrastructure posture tooling (AWS Config, Azure Policy, Nessus) verifies platform hardening. Focus: Secure deletion of data.

### Quick checklist

-   Interfaces — Agreements / - Configuration
-   Security — Agreements / - Configuration
-   Confidentiality — Agreements / - Configuration
-   Data — Agreements / - Configuration
-   Secure — Agreements / - Configuration

### Related articles on this site

-   [Microsoft Cloud Security Posture Management (CSPM)](https://support.icompaas.com/support/solutions/articles/62000234105-microsoft-cloud-security-posture-management-cspm-)
-   [Ensure Backup Data in Recovery Services Vaults Is Encrypted Using Customer-Managed Keys (CMK)](https://support.icompaas.com/support/solutions/articles/62000234845-ensure-backup-data-in-recovery-services-vaults-is-encrypted-using-customer-managed-keys-cmk-)
-   [Ensure EBS Volumes Attached to an EC2 Instance Are Marked for Deletion Upon Instance Termination](https://support.icompaas.com/support/solutions/articles/62000233975-ensure-ebs-volumes-attached-to-an-ec2-instance-are-marked-for-deletion-upon-instance-termination)
-   [Enable Transparent Data Encryption with Customer-Managed Keys on Azure SQL Servers for Enhanced Data Security](https://support.icompaas.com/support/solutions/articles/62000234802-enable-transparent-data-encryption-with-customer-managed-keys-on-azure-sql-servers-for-enhanced-data-)

## Related compliance guidance

- [SOC 2 compliance: a practical implementation guide for cloud-native SaaS teams](https://support.icompaas.com/compliance/soc-2-trust-services-criteria): Configuration checks like this one are the technical half of a SOC 2 / ISO 27001 programme — the guide shows where they fit, what else an auditor expects, and how to evidence them.
- [ISO/IEC 27001:2022 compliance: a practical implementation guide](https://support.icompaas.com/compliance/iso-27001-2022): ISO 27001 Annex A.8 (technological controls) is where cloud hardening evidence lands; the guide shows how to run the ISMS around it.