diff --git a/php/cache/cache.php b/php/cache/cache.php
new file mode 100644
index 0000000..10ea2dc
--- /dev/null
+++ b/php/cache/cache.php
@@ -0,0 +1,23 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2024 Sascha Nitsch (grumpydeveloper) https://contentnation.net/@grumpydevelop
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * @author Sascha Nitsch (grumpydeveloper)
+ **/
+
+namespace Federator\Cache;
+
+/**
+ * base class for remote authentication
+ */
+interface Cache extends \Federator\Connector\Connector
+{
+    /**
+     * save remote user by given session
+     * @param string $_session session id
+     * @param string $_user user/profile name
+     * @return \Federator\Data\User | null
+     */
+    public function saveRemoteUserBySession(string $_session, string $_user, \Federator\Data\User $user);
+}
diff --git a/plugins/rediscache.php b/plugins/rediscache.php
new file mode 100644
index 0000000..6f0b8cd
--- /dev/null
+++ b/plugins/rediscache.php
@@ -0,0 +1,42 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2024 Sascha Nitsch (grumpydeveloper) https://contentnation.net/@grumpydevelop
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * @author Sascha Nitsch <grumpydevelop@contentnation.net>
+ **/
+
+namespace Federator\Cache;
+
+/**
+ * Caching class using redis
+ */
+class RedisCache implements Cache
+{
+    /** @var \Redis connection handle */
+    private $redis;
+  
+    public function __construct()
+    {
+    }
+
+    /**
+     * get remote user by given session
+     * @param string $_session session id
+     * @param string $_user user/profile name
+     * @return \Data\User | null
+     */
+    public function getRemoteUserBySession(string $_session, string $_user)
+    {
+    }
+
+    public function saveRemoteUserBySession(string $_session, string $_user, \Federator\Data\User $user)
+    {
+    }
+}
+
+function dummy_rediscache(\Federator\Main $main)
+{
+    $rc = new RedisCache();
+    $main->setCache($rc);
+}