diff --git a/CryptClass/AbstractSKA.hpp b/CryptClass/AbstractSKA.hpp
new file mode 100644
index 0000000..b632149
--- /dev/null
+++ b/CryptClass/AbstractSKA.hpp
@@ -0,0 +1,29 @@
+/**
+ * @file AbstractSKA.hpp
+ * @brief Class for Symmetric-Key Algorithm (SKA)
+ * @author manzerbredes
+ * @date 8 Mars 2015
+ *
+ * Specify which method the algorithm must be implement.
+ *
+ */
+
+
+/**
+ * @class AbstractSKA AbstractSKA.hpp "/CryptClass/AbstractSKA.hpp"
+ * @brief Class for Symmetric-Key Algorithm (SKA)
+ * @author manzerbredes
+ *
+ * This should not be instanciate directly.
+ *
+ */
+
+class AbstractSKA {
+
+    public:
+        AbstractSKA();
+        ~AbstractSKA();
+
+        virtual void encrypt();
+        virtual void decrypt();
+};