diff --git a/application/core/IEncryption.php b/application/core/IEncryption.php
new file mode 100644
index 000000000..6b9132c23
--- /dev/null
+++ b/application/core/IEncryption.php
@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * Copyright (C) 2023 fhcomplete.org
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+interface IEncryption
+{
+	public function getEncryptedColumns(): array;
+}
+