V-38659, V-38662, V-38693: Encrypted storage exception docs

Implements: blueprint security-hardening

Change-Id: I05437825ae87307ad303f1bf937c631d7a93ca8e

doc/source/developer-notes/V-38659.rst

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+**Exception**
+
+Creating encrypted storage is left up to the deployer to consider and
+implement. Although encrypting data at rest on storage volumes does reduce
+the chances of data theft if the server is physically compromised, it doesn't
+provide protection from a user who is logged in while the server is running.
+
+Linux systems provide various options for storage encryption. The `Linux
+Unified Key Setup`_ is a good implementation to review.
+
+.. _Linux Unified Key Setup: https://en.wikipedia.org/wiki/Linux_Unified_Key_Setup

doc/source/developer-notes/V-38661.rst

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+V-38659.rst

doc/source/developer-notes/V-38662.rst

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+V-38659.rst

doc/source/developer-notes/V-38693.rst

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+V-38482.rst