diff --git a/tech/digital_authentication.wiki b/tech/digital_authentication.wiki
new file mode 100644
index 0000000..b6dc61f
--- /dev/null
+++ b/tech/digital_authentication.wiki
@@ -0,0 +1,31 @@
+= digital authentication =
+
+Establish confidence in user ID in an electronic system
+
+== requirements ==
+
+* ID system users, process, etc
+* Authenticate the ID of those users, processes etc
+
+Derived requirements from this,
+
+* use multi factor authentication
+* be replay resistant
+* prevent reuse of IDs for a defined period
+* disable ID after some period of inactivity
+* enforce a minimum complexity for passwords
+* prohibit passwords for a specific amount of time
+* store and transmit only cryptographically protected passwords
+* Obscure feedback from authentication
+  * IE don't say "wrong password" or "user does not exist"
+
+== means of authentication ==
+
+* password/pin
+* physical token (IE smart card)
+* static biometrics (IE finger/face)
+
+
+
+
+
diff --git a/tech/security.wiki b/tech/security.wiki
index cbc262c..ef78823 100644
--- a/tech/security.wiki
+++ b/tech/security.wiki
@@ -26,9 +26,10 @@ Hiding information
 * [[DSS]]
 * [[Eliptic_Curve]]
 
-=== [[Signatures]] ===
+=== [[Signatures]] and User auth ===
 
 * [[Signatures]]
+* [[digital_authentication]]
 
 === Misc ===