Security Groups

Alfa-Bank Balances Cloud Trust and Zero Trust Models During Migration to Yandex Cloud

Alfa-Bank's head of container and cloud security, Sasha Chertok, detailed how the bank migrated regulated workloads to Yandex Cloud while preserving existing Zero Trust controls. The organization mapped on-premises network segmentation, Active Directory authentication, and firewall policies directly onto Yandex Cloud resources using interconnect links secured with GOST encryption. Responsibility for managed services is shared under a Cloud Trust model, yet the bank retains oversight through Terraform-managed Security Groups, custom CSPM checks, and internal CI/CD gates. User access continues to authenticate via on-premises Active Directory and KeyCloak federations, while authorization leverages granular Yandex Cloud IAM roles. Logging and detection rely on a combination of Yandex Cloud Audit Trail, Cloud Logging, and the YCDR service to compensate for incomplete control-plane visibility. The resulting hybrid architecture now supports 1,500 virtual machines, 100 managed services, and 1,000 identities across multiple environments without disrupting established security processes.