Add documentation on how Android encryption works.
Change-Id: I20f55eca5e6043e0d8dd3eef4d3f17f5587c56af
diff --git a/src/tech/encryption/index.md b/src/tech/encryption/index.md
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+<!--
+ Copyright 2010 The Android Open Source Project
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+
+# Encryption Technical Information #
+
+Encryption on Android uses the dm-crypt layer in the Linux kernel. Read the
+detailed description of how it is tied into the Android system and what must
+be done on a new device to get this feature working.
+