Simplify multi-tenant encryption with a cost-conscious AWS KMS key strategy

The article discusses a cost-effective and secure strategy for managing encryption keys in multi-tenant SaaS environments using AWS Key Management Service (KMS).

• Introduces a centralized key management approach with one KMS key per tenant
• Uses cross-account IAM role delegation to securely share encryption keys
• Provides a method to encrypt tenant data across services while maintaining strict isolation
• Reduces operational complexity and AWS KMS costs by centralizing key management
• Implements fine-grained access controls using tenant-specific aliases and session policies

The solution enables organizations to scale their encryption infrastructure securely by using a single KMS key per tenant across multiple services and accounts, while maintaining robust security and compliance standards.