diff --git a/tech/AES.wiki b/tech/AES.wiki
new file mode 100644
index 0000000..ce930f3
--- /dev/null
+++ b/tech/AES.wiki
@@ -0,0 +1,4 @@
+= AES =
+
+The advanced encryption standard or AES is a modern block cipher with
+adjustable key length.
diff --git a/tech/DES.wiki b/tech/DES.wiki
new file mode 100644
index 0000000..20d7725
--- /dev/null
+++ b/tech/DES.wiki
@@ -0,0 +1,4 @@
+= DES =
+
+The data encyrption standard or DES is a depricated encryption algorithm with a
+56 bit key
diff --git a/tech/Impedance.wiki b/tech/Impedance.wiki
index 5a1a598..9ac0262 100644
--- a/tech/Impedance.wiki
+++ b/tech/Impedance.wiki
@@ -57,5 +57,5 @@ To match the impedance of two circuits, LC circuits are used to match the
 impedance. Two types are the pi and T network circuits, named such due to their
 appearance.
 
-Impedance matching can also be performed by transformers. Imedpance
+Impedance matching can also be performed by transformers. Impedance
 transformers do this exact task.
diff --git a/tech/security.wiki b/tech/security.wiki
index e8b277d..ede9a3f 100644
--- a/tech/security.wiki
+++ b/tech/security.wiki
@@ -10,9 +10,14 @@ Hiding information
 
 === Ciphers ===
 
-* [[substitution|Substitution]] 
+* [[substitution|Substitution]]
 * [[Affine]]
 
+Modern ciphers
+
+* [[DES]]
+* [[AES]]
+
 === Misc ===
 
 * [[LFSR|Linear Feedback Shift Registers]]