implementing-envelope-encryption-with-aws-kms

Envelope encryption is a strategy where data is encrypted with a data encryption key (DEK), and the DEK itself is encrypted with a master key (KEK) managed by AWS KMS. This approach allows encrypting

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Implementing Envelope Encryption with AWS KMS

Overview

Envelope encryption is a strategy where data is encrypted with a data encryption key (DEK), and the DEK itself is encrypted with a master key (KEK) managed by AWS KMS. This approach allows encrypting large volumes of data locally while keeping the master key secure in a hardware security module (HSM) managed by AWS. This skill covers implementing envelope encryption using AWS KMS GenerateDataKey API.

When to Use

When deploying or configuring implementing envelope encryption with aws kms capabilities in your environment

When establishing security controls aligned to compliance requirements

When building or improving security architecture for this domain

When conducting security assessments that require this implementation

Common Misconfigurations & Verification

KMS key policy / IAM too broad: granting kms:Decrypt on Resource: * or to a wide principal lets any compromised role decrypt every DEK. Scope policies to specific key ARNs and principals, and prefer time-bound, constrained grants (CreateGrant with Constraints) over standing permissions.

No encryption context: without an EncryptionContext, a ciphertext+encrypted-DEK can be replayed against another object. Bind a context (e.g. {"table":"users","id":"123"}) on GenerateDataKey/Decrypt and verify decryption fails when the context does not match.

Plaintext DEK persisted or logged: store ONLY the encrypted DEK; wipe the plaintext DEK from memory right after local AES-256-GCM encryption. Never log it.

DEK encrypting data without authentication: use AES-256-GCM for the local payload, not ECB/CBC-without-MAC.

No CloudTrail / no key rotation: enable CloudTrail on all KMS calls and enable automatic CMK rotation; re-wrap DEKs on rotation.

Verification: confirm GenerateDataKey returns both Plaintext and CiphertextBlob; round-trip decrypt recovers data; a wrong/altered encryption context is REJECTED; a tampered local ciphertext fails the GCM tag; and a principal lacking the key grant gets AccessDenied.

Prerequisites

Familiarity with cryptography concepts and tools

Access to a test or lab environment for safe execution