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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+
+======================================
+Shared VIM for Policy Action Execution
+======================================
+
+https://blueprints.launchpad.net/tacker/+spec/shared-barbican-secret
+
+This spec describes the plan to implement shared vim for policy action
+execution.
+
+
+Problem description
+===================
+
+In current implementation [1], a registered vim's password is encoded by
+fernet, and the fernet key is saved in barbican as a secret. With barbican's
+default policy, only the user who created the secret can obtain the secret,
+which leads to a problem that registered vim can not be shared by other tenants.
+
+So if we want to do VNF LCM operation not via tacker api, such as
+policy action execution, we have no keystone token to access barbican secret.
+
+BP [2] wants to use mistral to do vnf monitor and execute policy action，
+depending on this spec's realization.
+
+
+Proposed change
+===============
+
+There are three methods to fix this problem.
+wo will use the first method.
+
+* Save the fernet key in one specific tenant, such as tacker service tenant.
+  This method will lead to all vims can be invoked by other tenants.
+
+  The main implementation is as follows:
+    * register vim
+        We use fernet to encrypt the VIM password, then use the tacker service tenant
+        configured in the tacker.conf to save the fernet key to the barbican as a secret.
+        barbican will return **secret_uuid**.
+        then save encrypted into vim db's field **password**, and save the secret uuid
+        into vim db field **secret_uuid**.
+    * retrieving vim
+        We use the tacker service tenant configured in the tacker.conf and **secret_uuid**
+        to get the fernet key from barbican, and decode with **password** using fernet.
+    * delete vim
+        We use the tacker service tenant configured in the tacker.conf to delete
+        the secret by the **secret_uuid** in vim db from barbican.
+
+* we add the tacker service tenant to the acl of all fernet_key in barbican.
+  Only the service tenant can invoke all vims. The policy action will use
+  this service tenant.
+  this method we need to modify other project. So not recommended.
+
+* When create a VNF with monitor policy, we save the context information (
+  without token due to it has expired time). Then the policy action use these
+  information to access barbican.Originally, the fernet key is based on VIM.
+  If it is changed to this, it will be in VNF, so that it will store a lot of
+  secrect information. So not recommended.
+
+Data model impact
+-----------------
+
+None
+
+REST API impact
+---------------
+
+None
+
+Security impact
+---------------
+
+None
+
+Notifications impact
+--------------------
+
+None
+
+Other end user impact
+---------------------
+
+None
+
+Performance Impact
+------------------
+
+None
+
+Other deployer impact
+---------------------
+
+This feature requires "tacker" user which has "admin" role.
+When creating a "tacker" user via devstack, we need to add
+the "admin" role to the "tacker" user.
+
+Developer impact
+----------------
+
+None
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  Li Jiale <lijiale@cmss.chinamobile.com>
+
+Other contributors:
+  Yan Xing'an <yanxingan@cmss.chinamobile.com
+
+Work Items
+----------
+
+ * Unit Tests
+ * Functional Tests
+ * Feature documentation in doc/source/devref/feature
+
+
+Dependencies
+============
+
+None
+
+Testing
+=======
+
+None
+
+
+Documentation Impact
+====================
+
+* update doc/source/contributor/encrypt_vim_auth_with_barbican.rst
+  with new steps.
+
+
+References
+==========
+
+* https://blueprints.launchpad.net/tacker/+spec/encryption-with-barbican
+
+* https://blueprints.launchpad.net/tacker/+spec/mistral-monitor-policy