diff --git a/ospfd/ospf_dump.c b/ospfd/ospf_dump.c
index 8ace095..7e11e25 100644
--- a/ospfd/ospf_dump.c
+++ b/ospfd/ospf_dump.c
@@ -115,6 +115,16 @@
 };
 const int ospf_network_type_msg_max = OSPF_IFTYPE_MAX;
 
+/* AuType */
+const struct message ospf_auth_type_str[] =
+{
+  { OSPF_AUTH_NULL,          "Null"          },
+  { OSPF_AUTH_SIMPLE,        "Simple"        },
+  { OSPF_AUTH_CRYPTOGRAPHIC, "Cryptographic" },
+};
+const size_t ospf_auth_type_str_max = sizeof (ospf_auth_type_str) /
+  sizeof (ospf_auth_type_str[0]);
+
 /* Configuration debug option variables. */
 unsigned long conf_debug_ospf_packet[5] = {0, 0, 0, 0, 0};
 unsigned long conf_debug_ospf_event = 0;
@@ -657,6 +667,7 @@
 ospf_header_dump (struct ospf_header *ospfh)
 {
   char buf[9];
+  u_int16_t auth_type = ntohs (ospfh->auth_type);
 
   zlog_debug ("Header");
   zlog_debug ("  Version %d", ospfh->version);
@@ -666,9 +677,9 @@
   zlog_debug ("  Router ID %s", inet_ntoa (ospfh->router_id));
   zlog_debug ("  Area ID %s", inet_ntoa (ospfh->area_id));
   zlog_debug ("  Checksum 0x%x", ntohs (ospfh->checksum));
-  zlog_debug ("  AuType %d", ntohs (ospfh->auth_type));
+  zlog_debug ("  AuType %s", LOOKUP (ospf_auth_type_str, auth_type));
 
-  switch (ntohs (ospfh->auth_type))
+  switch (auth_type)
     {
     case OSPF_AUTH_NULL:
       break;
diff --git a/ospfd/ospf_dump.h b/ospfd/ospf_dump.h
index 455214f..a2d5e8b 100644
--- a/ospfd/ospf_dump.h
+++ b/ospfd/ospf_dump.h
@@ -122,6 +122,8 @@
 
 /* Message Strings. */
 extern char *ospf_lsa_type_str[];
+extern const struct message ospf_auth_type_str[];
+extern const size_t ospf_auth_type_str_max;
 
 /* Prototypes. */
 extern const char *ospf_area_name_string (struct ospf_area *);