Fixed typos
diff --git a/system/libraries/Encrypt.php b/system/libraries/Encrypt.php
index 5faf1f2..a46d4f4 100644
--- a/system/libraries/Encrypt.php
+++ b/system/libraries/Encrypt.php
@@ -65,7 +65,7 @@
 	protected $_hash_type		= 'sha1';
 
 	/**
-	 * Flag for the existance of mcrypt
+	 * Flag for the existence of mcrypt
 	 *
 	 * @var bool
 	 */