diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index ca34548..651d0f7 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -11,6 +11,7 @@ ADD_EXECUTABLE(it2s-itss-facilities
     tpm.c
     vcm.c
     evm.c
+    edm.c
 )
 
 TARGET_LINK_LIBRARIES(it2s-itss-facilities
diff --git a/src/edm.c b/src/edm.c
new file mode 100644
index 0000000..285faf5
--- /dev/null
+++ b/src/edm.c
@@ -0,0 +1,9 @@
+#include "edm.h"
+
+int edm_encap(void* its_msg, int its_msg_type) {
+    return 0;
+}
+
+int edm_decap(uint8_t* data, uint16_t data_len) {
+    return 0;
+}
diff --git a/src/edm.h b/src/edm.h
new file mode 100644
index 0000000..09f1742
--- /dev/null
+++ b/src/edm.h
@@ -0,0 +1,47 @@
+#pragma once
+
+#include <stdint.h>
+
+#define EDM_VE_MAX_MSGS 16
+#define EDM_MAX_VES 16
+
+typedef enum VE_MSG_TYPE {
+    iid,
+    hash
+} VE_MSG_TYPE_e;
+
+/*
+ * event message
+ */
+typedef struct ve_msg {
+    VE_MSG_TYPE_e present;   
+    union {
+        uint32_t iid;
+        uint8_t hash[32];
+    } choice;
+} ve_msg_t;
+
+/* 
+ * event 
+ */
+typedef struct ve {
+    uint32_t id;
+
+    uint64_t t_init;
+    uint64_t t_la;
+
+    ve_msg_t* ve_msgs[EDM_VE_MAX_MSGS];
+    uint8_t ve_msgs_len;
+} ve_t;
+
+/*
+ * event data manager
+ */
+typedef struct edm {
+    ve_t* ves[EDM_MAX_VES];
+    uint8_t ves_len;
+} edm_t;
+
+
+int edm_encap(void* its_msg, int its_msg_type);
+int edm_decap(uint8_t* data, uint16_t data_len);