diff --git a/mobile/shop/inicis/pay_approval.php b/mobile/shop/inicis/pay_approval.php
index 82e4eecaa..ea5ebd7f9 100644
--- a/mobile/shop/inicis/pay_approval.php
+++ b/mobile/shop/inicis/pay_approval.php
@@ -12,7 +12,7 @@ $oid  = trim($_REQUEST['P_NOTI']);
 $sql = " select * from {$g5['g5_shop_order_data_table']} where od_id = '$oid' ";
 $row = sql_fetch($sql);
 
-$data = unserialize($row['dt_data']);
+$data = unserialize(base64_decode($row['dt_data']));
 
 if(isset($data['pp_id']) && $data['pp_id']) {
     $order_action_url = G5_HTTPS_MSHOP_URL.'/personalpayformupdate.php';
diff --git a/mobile/shop/inicis/pay_return.php b/mobile/shop/inicis/pay_return.php
index 09f3b7643..af1d36e98 100644
--- a/mobile/shop/inicis/pay_return.php
+++ b/mobile/shop/inicis/pay_return.php
@@ -10,7 +10,7 @@ set_session('P_HASH', '');
 $sql = " select * from {$g5['g5_shop_order_data_table']} where od_id = '$oid' ";
 $row = sql_fetch($sql);
 
-$data = unserialize($row['dt_data']);
+$data = unserialize(base64_decode($row['dt_data']));
 
 if(isset($data['pp_id']) && $data['pp_id']) {
     $order_action_url = G5_HTTPS_MSHOP_URL.'/personalpayformupdate.php';
diff --git a/mobile/shop/kcp/order_approval_form.php b/mobile/shop/kcp/order_approval_form.php
index 07ecbbbe3..89d97b163 100644
--- a/mobile/shop/kcp/order_approval_form.php
+++ b/mobile/shop/kcp/order_approval_form.php
@@ -218,7 +218,7 @@ if($enc_data != '' && $enc_info != '' && $tran_cd != '') {
     $sql = " select * from {$g5['g5_shop_order_data_table']} where od_id = '$ordr_idxx' ";
     $row = sql_fetch($sql);
 
-    $data = unserialize($row['dt_data']);
+    $data = unserialize(base64_decode($row['dt_data']));
 
     if(isset($data['pp_id']) && $data['pp_id']) {
         $order_action_url = G5_HTTPS_MSHOP_URL.'/personalpayformupdate.php';
diff --git a/mobile/shop/lg/returnurl.php b/mobile/shop/lg/returnurl.php
index f37dec4fd..388695897 100644
--- a/mobile/shop/lg/returnurl.php
+++ b/mobile/shop/lg/returnurl.php
@@ -25,7 +25,7 @@ $LGD_OID          = $payReqMap['LGD_OID'];
 $sql = " select * from {$g5['g5_shop_order_data_table']} where od_id = '$LGD_OID' ";
 $row = sql_fetch($sql);
 
-$data = unserialize($row['dt_data']);
+$data = unserialize(base64_decode($row['dt_data']));
 
 if(isset($data['pp_id']) && $data['pp_id']) {
     $order_action_url = G5_HTTPS_MSHOP_URL.'/personalpayformupdate.php';
diff --git a/shop/ajax.orderdatasave.php b/shop/ajax.orderdatasave.php
index 615723e3d..1a3d2c3e9 100644
--- a/shop/ajax.orderdatasave.php
+++ b/shop/ajax.orderdatasave.php
@@ -16,7 +16,7 @@ sql_query($sql);
 
 $_POST['sw_direct'] = get_session('ss_direct');
 
-$dt_data = serialize($_POST);
+$dt_data = base64_encode(serialize($_POST));
 
 // 동일한 주문번호가 있는지 체크
 $sql = " select count(*) as cnt from {$g5['g5_shop_order_data_table']} where od_id = '$od_id' ";