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**To generate a 256-bit symmetric data key without a plaintext key** The following ``generate-data-key-without-plaintext`` example requests an encrypted copy of a 256-bit symmetric data key for use outside of AWS. You can call AWS KMS to decrypt the data key when you are ready to use it. To request a 256-bit data key, use the ``key-spec`` parameter with a value of ``AES_256``. To request a 128-bit data key, use the ``key-spec`` parameter with a value of ``AES_128``. For all other data key lengths, use the ``number-of-bytes`` parameter. The KMS key you specify must be a symmetric encryption KMS key, that is, a KMS key with a key spec value of SYMMETRIC_DEFAULT. :: aws kms generate-data-key-without-plaintext \ --key-id "arn:aws:kms:us-west-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab" \ --key-spec AES_256 Output:: { "CiphertextBlob": "AQEDAHjRYf5WytIc0C857tFSnBaPn2F8DgfmThbJlGfR8P3WlwAAAH4wfAYJKoZIhvcNAQcGoG8wbQIBADBoBgkqhkiG9w0BBwEwHgYJYIZIAWUDBAEuMBEEDEFogL", "KeyId": "arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab", "KeyMaterialId": "0b7fd7ddbac6eef27907413567cad8c810e2883dc8a7534067a82ee1142fc1e6" } The ``CiphertextBlob`` (encrypted data key) is returned in base64-encoded format. For more information, see `Data keys <https://docs.aws.amazon.com/kms/latest/developerguide/concepts.html#data-keys>`__ in the *AWS Key Management Service Developer Guide*.