diff --git a/adm/member_form.php b/adm/member_form.php
index bd7032072..adf4708c1 100644
--- a/adm/member_form.php
+++ b/adm/member_form.php
@@ -122,6 +122,11 @@ if(!isset($mb['mb_addr3'])) {
     sql_query(" ALTER TABLE {$g5['member_table']} ADD `mb_addr3` varchar(255) NOT NULL DEFAULT '' AFTER `mb_addr2` ", false);
 }
 
+// 중복가입 확인필드 추가
+if(!isset($mb['mb_dupinfo'])) {
+    sql_query(" ALTER TABLE {$g5['member_table']} ADD `mb_dupinfo` varchar(255) NOT NULL DEFAULT '' AFTER `mb_adult` ", false);
+}
+
 if ($mb['mb_intercept_date']) $g5['title'] = "차단된 ";
 else $g5['title'] .= "";
 $g5['title'] .= '회원 '.$html_title;
diff --git a/bbs/register_form_update.php b/bbs/register_form_update.php
index b593792cc..4d57c6d76 100644
--- a/bbs/register_form_update.php
+++ b/bbs/register_form_update.php
@@ -148,12 +148,12 @@ if (isset($_FILES['mb_icon']) && is_uploaded_file($_FILES['mb_icon']['tmp_name']
 //  본인확인
 //---------------------------------------------------------------
 $mb_hp = hyphen_hp_number($mb_hp);
-if($_SESSION['ss_cert_type'] != 'hp' && $mb_hp) {
-    // 휴대폰번호 중복체크
-    $sql = " select mb_id from {$g5['member_table']} where mb_id <> '{$member['mb_id']}' and mb_hp = '{$mb_hp}' ";
+if($config['cf_cert_use'] && $_SESSION['ss_cert_type'] && $_SESSION['ss_cert_dupinfo']) {
+    // 중복체크
+    $sql = " select mb_id from {$g5['member_table']} where mb_id <> '{$member['mb_id']}' and mb_dupinfo = '{$_SESSION['ss_cert_dupinfo']}' ";
     $row = sql_fetch($sql);
     if ($row['mb_id']) {
-        alert("이미 가입되어 있는 휴대폰번호 입니다.\\n회원아이디 : ".$row['mb_id']);
+        alert("입력하신 본인확인 정보로 가입된 내역이 존재합니다.\\n회원아이디 : ".$row['mb_id']);
     }
 }
 
@@ -168,6 +168,7 @@ if ($config['cf_cert_use'] && $cert_type && $md5_cert_no) {
         $sql_certify .= " , mb_adult = '{$_SESSION['ss_cert_adult']}' ";
         $sql_certify .= " , mb_birth = '{$_SESSION['ss_cert_birth']}' ";
         $sql_certify .= " , mb_sex = '{$_SESSION['ss_cert_sex']}' ";
+        $sql_certify .= " , mb_dupinfo = '{$_SESSION['ss_cert_dupinfo']}' ";
     } else {
         $sql_certify .= " , mb_hp = '{$mb_hp}' ";
         $sql_certify .= " , mb_certify  = '' ";
diff --git a/install/gnuboard5.sql b/install/gnuboard5.sql
index 580696a2b..bc0f35f17 100644
--- a/install/gnuboard5.sql
+++ b/install/gnuboard5.sql
@@ -452,6 +452,7 @@ CREATE TABLE IF NOT EXISTS `g5_member` (
   `mb_hp` varchar(255) NOT NULL default '',
   `mb_certify` varchar(20) NOT NULL default '',
   `mb_adult` tinyint(4) NOT NULL default '0',
+  `mb_dupinfo` varchar(255) NOT NULL default '',
   `mb_zip1` char(3) NOT NULL default '',
   `mb_zip2` char(3) NOT NULL default '',
   `mb_addr1` varchar(255) NOT NULL default '',
diff --git a/plugin/kcpcert/kcpcert_result.php b/plugin/kcpcert/kcpcert_result.php
index fb642a557..a7e06a03f 100644
--- a/plugin/kcpcert/kcpcert_result.php
+++ b/plugin/kcpcert/kcpcert_result.php
@@ -134,11 +134,12 @@ if( $cert_enc_use == "Y" )
             alert_close("정상적인 인증이 아닙니다. 올바른 방법으로 이용해 주세요.");
 
         $phone_no = hyphen_hp_number($phone_no);
+        $mb_dupinfo = $di;
 
-        $sql = " select mb_id from {$g5['member_table']} where mb_id <> '{$member['mb_id']}' and mb_hp = '{$phone_no}' ";
+        $sql = " select mb_id from {$g5['member_table']} where mb_id <> '{$member['mb_id']}' and mb_dupinfo = '{$mb_dupinfo}' ";
         $row = sql_fetch($sql);
         if ($row['mb_id']) {
-            alert_close("이미 가입되어 있는 휴대폰번호 입니다.\\n회원아이디 : ".$row['mb_id']);
+            alert_close("입력하신 본인학인 정보로 가입된 내역이 존재합니다.\\n회원아이디 : ".$row['mb_id']);
         }
 
         // hash 데이터
@@ -156,6 +157,7 @@ if( $cert_enc_use == "Y" )
         set_session("ss_cert_adult",   $adult);
         set_session("ss_cert_birth",   $birth_day);
         set_session("ss_cert_sex",     ($sex_code=="01"?"M":"F"));
+        set_session('ss_cert_dupinfo', $mb_dupinfo);
     }
     else if( $res_cd != "0000" )
     {
diff --git a/plugin/okname/hpcert2.php b/plugin/okname/hpcert2.php
index 3f5ed6d72..5a53777f6 100644
--- a/plugin/okname/hpcert2.php
+++ b/plugin/okname/hpcert2.php
@@ -95,13 +95,14 @@ echo "리턴메시지        :$field[16] <br/>";
 $mb_name = $field[7];
 $req_num = $field[12];
 $mb_birth = $field[8];
-
-// 휴대폰번호 중복체크
+$mb_dupinfo = $field[4];
 $phone_no = hyphen_hp_number($req_num);
-$sql = " select mb_id from {$g5['member_table']} where mb_id <> '{$member['mb_id']}' and mb_hp = '{$phone_no}' ";
+
+// 중복정보 체크
+$sql = " select mb_id from {$g5['member_table']} where mb_id <> '{$member['mb_id']}' and mb_dupinfo = '{$mb_dupinfo}' ";
 $row = sql_fetch($sql);
 if ($row['mb_id']) {
-    alert_close("이미 가입되어 있는 휴대폰번호 입니다.\\n회원아이디 : ".$row['mb_id']);
+    alert_close("입력하신 본인학인 정보로 가입된 내역이 존재합니다.\\n회원아이디 : ".$row['mb_id']);
 }
 
 // hash 데이터
@@ -119,6 +120,7 @@ set_session('ss_cert_hash',    $hash_data);
 set_session('ss_cert_adult',   $adult);
 set_session('ss_cert_birth',   $mb_birth);
 set_session('ss_cert_sex',     ($field[9] == 1 ? 'M' : 'F'));
+set_session('ss_cert_dupinfo', $mb_dupinfo);
 
 $g5['title'] = 'KCB 휴대폰 본인확인';
 include_once(G5_PATH.'/head.sub.php');
diff --git a/plugin/okname/ipin2.php b/plugin/okname/ipin2.php
index 43dc61e02..dda65f104 100644
--- a/plugin/okname/ipin2.php
+++ b/plugin/okname/ipin2.php
@@ -67,6 +67,14 @@ $field_name_IPIN_DEC = array(
 $mb_name = $field[6];
 $req_num = $field[7];
 $mb_birth = $field[11];
+$mb_dupinfo = $field[0];
+
+// 중복정보 체크
+$sql = " select mb_id from {$g5['member_table']} where mb_id <> '{$member['mb_id']}' and mb_dupinfo = '{$mb_dupinfo}' ";
+$row = sql_fetch($sql);
+if ($row['mb_id']) {
+    alert_close("입력하신 본인확인 정보로 가입된 내역이 존재합니다.\\n회원아이디 : ".$row['mb_id']);
+}
 
 // hash 데이터
 $cert_type = 'ipin';
@@ -82,6 +90,7 @@ set_session('ss_cert_hash',    $hash_data);
 set_session('ss_cert_adult',   $adult);
 set_session('ss_cert_birth',   $mb_birth);
 set_session('ss_cert_sex',     ($field[9] == 1 ? 'M' : 'F'));
+set_session('ss_cert_dupinfo', $mb_dupinfo);
 
 $g5['title'] = 'KCB 아이핀 본인확인';
 include_once(G5_PATH.'/head.sub.php');