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+# Encrypted volumes with IBM HPCS or Key Protect
+
+IBM Cloud™ Hyper Protect Crypto Services is a key management and cloud hardware
+security module (HSM). It is designed to enable a user to take control of their
+cloud data encryption keys and cloud hardware security models. To support this
+KMS integration in Ceph CSI and thus enable the HPCS users to make use of the
+same in RBD volume encrypted operations, below things are considered.
+
+## Connection to IBM HPCS/key Protect service
+
+Below parameters/values can be used to establish the connection to the HPCS
+service from the CSI driver and to make use of the encryption operations:
+
+```console
+* KMS_SERVICE_NAME=[kms_service_name]
+A unique name for the key management service within the project.
+
+* SERVICE_INSTANCE_ID=[service_instance_id]
+The Instance ID of the IBM HPCS service, ex:  crn:v1:bluemix:public:hs-crypto:us-south:a/5d19cf8b82874c2dab37e397426fbc42:e2ae65ff-954b-453f-b0d7-fc5064c203ce::
+
+* SERVICE_API_KEY=[service_api_key]
+Ex:  06x6DbTkVQ-qCRmq9cK-p9xOQpU2UwJMcdjnIDdr0g2R
+
+* CUSTOMER_ROOT_KEY=[customer_root_key]
+Ex: c7a9aa91-5cb5-48da-a821-e85c27b99d92
+
+* KP_REGION = [region of the key protect service]
+Ex: us-south-2
+```
+
+### Values provided in the connection secret
+
+Considering `SERVICE_API_KEY` and `CUSTOMER_ROOT_KEY` are sensitive information,
+those will be provided as a kubernetes secret to the CSI driver. The Ceph CSI
+KMS plugin interface for the key protect will read the secret name from the kms
+configmap and fetch these values. `SESSION_TOKEN and CRK_ARN` values can also be
+provided by the user as part of the secret if needed. However these values are
+considered to be optional.
+
+### Values provided in the config map
+
+`SERVICE_INSTANCE_ID` is part of the kms configmap and there could be an
+optional value provided in the configmap for `REGION` too.
+
+### Storage class values or configuration
+
+As like other KMS enablement, the storage class has to be enabled for encryption
+and `encryptionKMSID` has to be provided which is the matching value in the kms
+config map to `KMS_SERVICE_NAME`.
+
+## Volume Encrypt or Decrypt Operation
+
+The IBM Key protect server's `wrap` and `unwrap` functionalities will be used by
+the Ceph CSI driver to achieve encryption and decryption of RBD volumes. The DEK
+can be wrapped with the help of Customer Root Key (CRK) and can be used for LUKS
+operation. The wrapped cipher blob will be stored inside the RBD image
+metadata ( as in other KMS integration, ex: AWS). At time of decrypt the DEK
+will be unwrapped with the help of cipher blob and Key Protect server
+
+## Integration APIS
+
+https://github.com/IBM/keyprotect-go-client provide the client SDK to interact
+with the Key Protect server and perform key protect operations.
+
+## Additional Reference#
+
+https://cloud.ibm.com/docs/key-protect
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