Updated Encryption (markdown)

Encryption.md

@@ -1,5 +1,7 @@
-Currently we support these encryption methods:
-- aes-256-cfb: Default and recommended.
+Supported Ciphers
+=================
+
+- aes-256-cfb: Default
 - aes-128-cfb
 - aes-192-cfb
 - aes-256-ofb
@@ -26,8 +28,23 @@ Currently we support these encryption methods:
 - seed-cfb
 - salsa20-ctr
 
+rc4-md5
+=======
 `rc4-md5` is a safe, fast encryption that use different key per connection. It is recommended for OpenWRT routers.
 
-These methods are legacy and not safe. Do not use them:
+salsa20-ctr
+===========
+salsa20-ctr is a fast stream cipher.
+
+Install these packages if you want to use it:
+
+Debian / Ubuntu:
+
+    apt-get install python-numpy
+    pip install salsa20
+
+Deprecated Ciphers
+==================
+These ciphers are legacy and not safe. Do not use them:
 - rc4
 - table