diff --git a/math/Trap_door.wiki b/math/Trap_door.wiki
new file mode 100644
index 0000000..e22cdd8
--- /dev/null
+++ b/math/Trap_door.wiki
@@ -0,0 +1,4 @@
+= Trap door =
+
+A trap door function is a function that maps some domain to a range, and the
+process of solving the inverse of said function is infeasable
diff --git a/tech/Eliptic_Curve.wiki b/tech/Eliptic_Curve.wiki
index ed4c82a..06b7101 100644
--- a/tech/Eliptic_Curve.wiki
+++ b/tech/Eliptic_Curve.wiki
@@ -2,7 +2,8 @@
 
 ECC is an algorithm that solves the same problem as [[RSA]], but with smaller
 key sizes. It is asymetric and based on [[../math/Eliptic_Curve]]s and based on
-the difficulty of inding a curve given points on said curve.
+the difficulty of inding a curve given points on said curve, and a
+[[../math/Trap_door]]
 
 == algorithm ==
 
diff --git a/tech/Signatures.wiki b/tech/Signatures.wiki
new file mode 100644
index 0000000..c9c6457
--- /dev/null
+++ b/tech/Signatures.wiki
@@ -0,0 +1,9 @@
+= Signature =
+
+A signature is a way of verifying that someone is who they claim they are. They
+are generally composed of a
+
+* hash of the algorithm
+* cryptographic way of verifying the signed message
+
+However to ensure
diff --git a/tech/security.wiki b/tech/security.wiki
index 3c6698c..cbc262c 100644
--- a/tech/security.wiki
+++ b/tech/security.wiki
@@ -26,14 +26,18 @@ Hiding information
 * [[DSS]]
 * [[Eliptic_Curve]]
 
+=== [[Signatures]] ===
+
+* [[Signatures]]
+
 === Misc ===
 
 * [[LFSR|Linear Feedback Shift Registers]]
-* [[modular_exponentiation|Modular Exponentiation]]
 
 === Math for Crypto ===
 
-* [[../math/congruences]]
+* [[../math/congruences|Congruneces]]
+* [[modular_exponentiation|Modular Exponentiation]]
 
 -------------------