diff --git a/platform/src/packet_io.cpp b/platform/src/packet_io.cpp
index e572c7e..033c692 100644
--- a/platform/src/packet_io.cpp
+++ b/platform/src/packet_io.cpp
@@ -15,12 +15,13 @@
 #include "ctrl_packet.h"
 #include "global_metrics.h"
 
+#define RX_BURST_MAX 128
+#define MR_MASK_DECRYPTED 0x01
+
 /******************************************************************************
  * struct
  ******************************************************************************/
 
-#define RX_BURST_MAX 128
-
 struct config
 {
     int bypass_all_traffic;
@@ -91,13 +92,20 @@ int mbuff_get_metadata(marsio_buff_t *rx_buff, struct metadata *meta)
     else
     {
         meta->is_ctrl_pkt = 0;
-#if 0
-        if (marsio_buff_get_metadata(rx_buff, MR_IS_DECRYPTED, &(meta->is_decrypted), sizeof(meta->is_decrypted)) <= 0)
+        uint16_t user_data = 0;
+        if (marsio_buff_get_metadata(rx_buff, MR_BUFF_USER_0, &user_data, sizeof(user_data)) <= 0)
         {
             LOG_ERROR("%s: unable to get is_decrypted from metadata", LOG_TAG_PKTIO);
             return -1;
         }
-#endif
+        if (user_data & MR_MASK_DECRYPTED)
+        {
+            meta->is_decrypted = 1;
+        }
+        else
+        {
+            meta->is_decrypted = 0;
+        }
     }
 
     meta->sids.num = marsio_buff_get_sid_list(rx_buff, meta->sids.elems, sizeof(meta->sids.elems) / sizeof(meta->sids.elems[0]));
@@ -143,14 +151,17 @@ int mbuff_set_metadata(marsio_buff_t *tx_buff, struct metadata *meta)
     }
     else
     {
-        // TODO
-#if 0
-        if (marsio_buff_set_metadata(tx_buff, MR_IS_DECRYPTED, &(meta->is_decrypted), sizeof(meta->is_decrypted)) != 0)
+        uint16_t user_data = 0;
+        if (meta->is_decrypted)
+        {
+            user_data = MR_MASK_DECRYPTED;
+        }
+
+        if (marsio_buff_set_metadata(tx_buff, MR_BUFF_USER_0, &user_data, sizeof(user_data)) != 0)
         {
             LOG_ERROR("%s: unable to set is_decrypted for metadata", LOG_TAG_PKTIO);
             return -1;
         }
-#endif
     }
 
     if (meta->sids.num > 0)
diff --git a/test/marsio.cpp b/test/marsio.cpp
index 1a6c974..bda26b9 100644
--- a/test/marsio.cpp
+++ b/test/marsio.cpp
@@ -55,6 +55,7 @@ struct mrb_metadata
     uint16_t port_egress;
 
     uint16_t link_db_index;
+    uint16_t user_data_0;
 };
 
 struct mock_marsio_buff_t
@@ -171,6 +172,9 @@ int marsio_buff_set_metadata(marsio_buff_t *m, enum mr_buff_metadata_type type,
     case MR_BUFF_PAYLOAD_OFFSET:
         mrb_metadata->payload_offset = *(uint16_t *)data;
         return 0;
+    case MR_BUFF_USER_0:
+        mrb_metadata->user_data_0 = *(uint16_t *)data;
+        return 0;
     default:
         return -1;
     }
@@ -224,6 +228,13 @@ int marsio_buff_get_metadata(marsio_buff_t *m, enum mr_buff_metadata_type type,
         }
         *(uint16_t *)(data) = (uint16_t)mrb_metadata->payload_offset;
         return sizeof(uint16_t);
+    case MR_BUFF_USER_0:
+        if (sz_data < sizeof(uint16_t))
+        {
+            return -1;
+        }
+        *(uint16_t *)(data) = (uint16_t)mrb_metadata->user_data_0;
+        return sizeof(uint16_t);
     default:
         return -1;
     }
diff --git a/test/marsio.h b/test/marsio.h
index 3ea0dc2..516c824 100644
--- a/test/marsio.h
+++ b/test/marsio.h
@@ -38,7 +38,8 @@ enum mr_buff_metadata_type
     MR_BUFF_ROUTE_CTX = 2,
     MR_BUFF_SESSION_ID = 3,
     MR_BUFF_DIR = 4,
-    MR_BUFF_PAYLOAD_OFFSET = 5
+    MR_BUFF_PAYLOAD_OFFSET = 5,
+    MR_BUFF_USER_0 = 254,
 };
 
 struct mr_instance *marsio_create();