add preface

Big Ideas/2-Authentication.md

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+# Authentication
+
+## Identify who/what you need to authenticate
+
+
+
+## Identify who/what you need to authenticate to
+
+## Level of Confidence in your Authentication
+
+## How long should you trust an Authentication?
+
+## Authentication Design Worksheet
+
+1.  Identify the users and systems you need to authenticate
+
+------------------------
+
+2. Identify the users and systems you need to authenticate to answer number 1
+
+------------------------
+
+3. Decide the levels of confidence you need to establish between the two answers above
+
+------------------------
+
+4. How long can I trust someone after they've authenticated?
+------------------------