diff --git a/src/sec-rule-chrono-chat.h b/src/sec-rule-chrono-chat.h
new file mode 100644
index 0000000..d165122
--- /dev/null
+++ b/src/sec-rule-chrono-chat.h
@@ -0,0 +1,46 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013, Regents of the University of California
+ *                     Yingdi Yu
+ *
+ * BSD license, See the LICENSE file for more information
+ *
+ * Author: Yingdi Yu <yingdi@cs.ucla.edu>
+ */
+
+#ifndef SEC_RULE_CHRONO_CHAT_H
+#define SEC_RULE_CHRONO_CHAT_H
+
+#include <ndn-cpp-et/policy/sec-rule.hpp>
+#include <ndn-cpp-et/regex/regex.hpp>
+
+class SecRuleChronoChat : public ndn::SecRule
+{
+  
+public:
+  SecRuleChronoChat(ndn::ptr_lib::shared_ptr<ndn::Regex> dataRegex,
+                    ndn::ptr_lib::shared_ptr<ndn::Regex> signerRegex);
+
+  SecRuleChronoChat(const SecRuleChronoChat& rule);
+
+  virtual
+  ~SecRuleChronoChat() {};
+
+  bool 
+  matchDataName(const ndn::Data & data);
+
+  bool 
+  matchSignerName(const ndn::Data & data);
+
+  bool
+  satisfy(const ndn::Data & data);
+
+  bool
+  satisfy(const ndn::Name & dataName, const ndn::Name & signerName);
+  
+private:
+  ndn::ptr_lib::shared_ptr<ndn::Regex> m_dataRegex;
+  ndn::ptr_lib::shared_ptr<ndn::Regex> m_signerRegex;
+};
+
+#endif //CHAT_POLICY_RULE_H