Envelope encryption explained: Why you probably shouldn't implement it yourself

Managing encryption at scale involves complexities beyond merely selecting an algorithm like AES-256; the real challenge lies in key management, particularly when using a single key, which poses risks like data loss, key rotation difficulties, and security breaches. Envelope encryption offers a robust solution by introducing two layers of keys: the Data Encryption Key (DEK) and the Key Encryption Key (KEK). The DEK, which encrypts the actual data, is unique and short-lived, while the KEK, which encrypts DEKs, is long-lived and stored securely in a Hardware Security Module (HSM). This design makes key rotation efficient, limits the damage from potential breaches to individual data objects, enables multi-tenant cryptographic isolation, and supports customer-supplied keys (BYOK). Implementing envelope encryption requires careful attention to avoid pitfalls such as improper DEK storage or KEK management, making managed services like WorkOS Vault, AWS KMS, Google Cloud KMS, and Azure Key Vault more practical for most organizations.

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