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+==========
+Encryption
+==========
+
+.. versionadded:: Luminous
+
+The Ceph Object Gateway supports server-side encryption of uploaded objects,
+with 3 options for the management of encryption keys. Server-side encryption
+means that the data is sent over HTTP in its unencrypted form, and the Ceph
+Object Gateway stores that data in the Ceph Storage Cluster in encrypted form.
+
+Customer-Provided Keys
+======================
+
+In this mode, the client passes an encryption key along with each request to
+read or write encrypted data. It is the client's responsibility to manage those
+keys and remember which key was used to encrypt each object.
+
+This is implemented in S3 according to the `Amazon SSE-C`_ specification.
+
+As all key management is handled by the client, no special configuration is
+needed to support this encryption mode.
+
+Key Management Service
+======================
+
+This mode allows keys to be stored in a secure key management service and
+retrieved on demand by the Ceph Object Gateway to serve requests to encrypt
+or decrypt data.
+
+This is implemented in S3 according to the `Amazon SSE-KMS`_ specification.
+
+In principle, any key management service could be used here, but currently
+only integration with `Barbican`_ is implemented.
+
+See `OpenStack Barbican Integration`_.
+
+Automatic Encryption (for testing only)
+=======================================
+
+A ``rgw crypt default encryption key`` can be set in ceph.conf to force the
+encryption of all objects that do not otherwise specify an encryption mode.
+
+The configuration expects a base64-encoded 256 bit key. For example::
+
+  rgw crypt default encryption key = 4YSmvJtBv0aZ7geVgAsdpRnLBEwWSWlMIGnRS8a9TSA=
+
+.. important:: This mode is for diagnostic purposes only! The ceph configuration
+   file is not a secure method for storing encryption keys. Keys that are
+   accidentally exposed in this way should be considered compromised.
+
+
+.. _Amazon SSE-C: https://docs.aws.amazon.com/AmazonS3/latest/dev/ServerSideEncryptionCustomerKeys.html
+.. _Amazon SSE-KMS: http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingKMSEncryption.html
+.. _Barbican: https://wiki.openstack.org/wiki/Barbican
+.. _OpenStack Barbican Integration: ../barbican