diff --git a/adm/member_form.php b/adm/member_form.php
index efeed3d77..696584c37 100644
--- a/adm/member_form.php
+++ b/adm/member_form.php
@@ -240,9 +240,9 @@ add_javascript(G5_POSTCODE_JS, 0);    //다음 주소 js
             <input type="file" name="mb_icon" id="mb_icon">
             <?php
             $mb_dir = substr($mb['mb_id'],0,2);
-            $icon_file = G5_DATA_PATH.'/member/'.$mb_dir.'/'.$mb['mb_id'].'.gif';
+            $icon_file = G5_DATA_PATH.'/member/'.$mb_dir.'/'.get_mb_icon_name($mb['mb_id']).'.gif';
             if (file_exists($icon_file)) {
-                $icon_url = G5_DATA_URL.'/member/'.$mb_dir.'/'.$mb['mb_id'].'.gif';
+                $icon_url = str_replace(G5_DATA_PATH, G5_DATA_URL, $icon_file);
                 echo '<img src="'.$icon_url.'" alt="">';
                 echo '<input type="checkbox" id="del_mb_icon" name="del_mb_icon" value="1">삭제';
             }
@@ -256,9 +256,9 @@ add_javascript(G5_POSTCODE_JS, 0);    //다음 주소 js
             <input type="file" name="mb_img" id="mb_img">
             <?php
             $mb_dir = substr($mb['mb_id'],0,2);
-            $icon_file = G5_DATA_PATH.'/member_image/'.$mb_dir.'/'.$mb['mb_id'].'.gif';
+            $icon_file = G5_DATA_PATH.'/member_image/'.$mb_dir.'/'.get_mb_icon_name($mb['mb_id']).'.gif';
             if (file_exists($icon_file)) {
-                $icon_url = G5_DATA_URL.'/member_image/'.$mb_dir.'/'.$mb['mb_id'].'.gif';
+                $icon_url = str_replace(G5_DATA_PATH, G5_DATA_URL, $icon_file);
                 echo '<img src="'.$icon_url.'" alt="">';
                 echo '<input type="checkbox" id="del_mb_img" name="del_mb_img" value="1">삭제';
             }
diff --git a/adm/member_form_update.php b/adm/member_form_update.php
index 757a9d1ad..54b90839b 100644
--- a/adm/member_form_update.php
+++ b/adm/member_form_update.php
@@ -116,13 +116,13 @@ else if ($w == 'u')
         alert('이미 존재하는 이메일입니다.\\nＩＤ : '.$row['mb_id'].'\\n이름 : '.$row['mb_name'].'\\n닉네임 : '.$row['mb_nick'].'\\n메일 : '.$row['mb_email']);
 
     $mb_dir = substr($mb_id,0,2);
+    $mb_icon_img = get_mb_icon_name($mb_id).'.gif';
 
     // 회원 아이콘 삭제
     if ($del_mb_icon)
-        @unlink(G5_DATA_PATH.'/member/'.$mb_dir.'/'.$mb_id.'.gif');
+        @unlink(G5_DATA_PATH.'/member/'.$mb_dir.'/'.$mb_icon_img);
 
     $image_regex = "/(\.(gif|jpe?g|png))$/i";
-    $mb_icon_img = $mb_id.'.gif';
 
     // 아이콘 업로드
     if (isset($_FILES['mb_icon']) && is_uploaded_file($_FILES['mb_icon']['tmp_name'])) {
diff --git a/bbs/formmail.php b/bbs/formmail.php
index fe099d23e..fdd045ecf 100644
--- a/bbs/formmail.php
+++ b/bbs/formmail.php
@@ -8,6 +8,11 @@ if (!$config['cf_email_use'])
 if (!$is_member && $config['cf_formmail_is_member'])
     alert_close('회원만 이용하실 수 있습니다.');
 
+$mb_id = isset($mb_id) ? $mb_id : '';
+$mb_hash = isset($mb_hash) ? $mb_hash : '';
+
+$mb_id = get_search_string(get_member_by_hash($mb_id, $mb_hash));
+
 if ($is_member && !$member['mb_open'] && $is_admin != "super" && $member['mb_id'] != $mb_id)
     alert_close('자신의 정보를 공개하지 않으면 다른분에게 메일을 보낼 수 없습니다.\\n\\n정보공개 설정은 회원정보수정에서 하실 수 있습니다.');
 
diff --git a/bbs/list.php b/bbs/list.php
index 85f179c7c..8e089bad0 100644
--- a/bbs/list.php
+++ b/bbs/list.php
@@ -36,9 +36,9 @@ $stx = trim($stx);
 //검색인지 아닌지 구분하는 변수 초기화
 $is_search_bbs = false;
 
-if ($sca || $stx || $stx === '0') {     //검색이면
+if ($sca || $stx || $mb_hash || $stx === '0') {     //검색이면
     $is_search_bbs = true;      //검색구분변수 true 지정
-    $sql_search = get_sql_search($sca, $sfl, $stx, $sop);
+    $sql_search = get_sql_search($sca, $sfl, $stx, $sop, $mb_hash);
 
     // 가장 작은 번호를 얻어서 변수에 저장 (하단의 페이징에서 사용)
     $sql = " select MIN(wr_num) as min_wr_num from {$write_table} ";
@@ -202,6 +202,10 @@ if($page_rows > 0) {
 
 g5_latest_cache_data($board['bo_table'], $list);
 
+if( $mb_hash ){
+    $qstr.="&amp;mb_hash=$mb_hash";
+}
+
 $write_pages = get_paging(G5_IS_MOBILE ? $config['cf_mobile_pages'] : $config['cf_write_pages'], $page, $total_page, get_pretty_url($bo_table, '', $qstr.'&amp;page='));
 
 $list_href = '';
diff --git a/bbs/memo_form.php b/bbs/memo_form.php
index 4ada2ccc3..7fff33cf4 100644
--- a/bbs/memo_form.php
+++ b/bbs/memo_form.php
@@ -10,9 +10,18 @@ if (!$member['mb_open'] && $is_admin != 'super' && $member['mb_id'] != $mb_id)
 
 $content = "";
 // 탈퇴한 회원에게 쪽지 보낼 수 없음
-if ($me_recv_mb_id)
+
+$mb_id = isset($mb_id) ? $mb_id : '';
+$mb_hash = isset($mb_hash) ? $mb_hash : '';
+$me_recv_mb_nicks = '';
+
+if ($mb_id || $mb_hash)
 {
+    $me_recv_mb_id = get_search_string(get_member_by_hash($mb_id, $mb_hash));
+
     $mb = get_member($me_recv_mb_id);
+    $me_recv_mb_nicks = $mb['mb_nick'];
+
     if (!$mb['mb_id'])
         alert_close('회원정보가 존재하지 않습니다.\\n\\n탈퇴하였을 수 있습니다.');
 
diff --git a/bbs/memo_form_update.php b/bbs/memo_form_update.php
index 2835b9a76..ae5a3a9f0 100644
--- a/bbs/memo_form_update.php
+++ b/bbs/memo_form_update.php
@@ -9,16 +9,21 @@ if (!chk_captcha()) {
     alert('자동등록방지 숫자가 틀렸습니다.');
 }
 
-$recv_list = explode(',', trim($_POST['me_recv_mb_id']));
+$recv_list = explode(',', trim($_POST['me_recv_mb_nicks']));
 $str_nick_list = '';
 $msg = '';
 $error_list  = array();
-$member_list = array();
+$member_list = array('id'=>array(), 'nick'=>array());
 
 start_event('memo_form_update_before', $recv_list);
 
 for ($i=0; $i<count($recv_list); $i++) {
-    $row = sql_fetch(" select mb_id, mb_nick, mb_open, mb_leave_date, mb_intercept_date from {$g5['member_table']} where mb_id = '{$recv_list[$i]}' ");
+
+    $recv_nick = preg_replace('/\s+/', '', get_search_string($recv_list[$i]));
+    
+    $sql = " select mb_id, mb_nick, mb_open, mb_leave_date, mb_intercept_date from {$g5['member_table']} where mb_nick = '".sql_real_escape_string($recv_nick)."' ";
+
+    $row = sql_fetch($sql);
     if ($row) {
         if ($is_admin || ($row['mb_open'] && (!$row['mb_leave_date'] || !$row['mb_intercept_date']))) {
             $member_list['id'][]   = $row['mb_id'];
@@ -44,6 +49,10 @@ $error_msg = implode(",", $error_list);
 if ($error_msg && !$is_admin)
     alert("회원아이디 '{$error_msg}' 은(는) 존재(또는 정보공개)하지 않는 회원아이디 이거나 탈퇴, 접근차단된 회원아이디 입니다.\\n쪽지를 발송하지 않았습니다.");
 
+if (! count($member_list['id'])){
+    alert('해당 회원이 존재하지 않습니다.');
+}
+
 if (!$is_admin) {
     if (count($member_list['id'])) {
         $point = (int)$config['cf_memo_send_point'] * count($member_list['id']);
@@ -88,6 +97,8 @@ if ($member_list) {
     $redirect_url = G5_HTTP_BBS_URL."/memo_form.php";
     
     start_event('memo_form_update_failed', $member_list, $redirect_url);
+    
+    exit;
 
     alert("회원아이디 오류 같습니다.", $redirect_url, false);
 }
diff --git a/bbs/new.php b/bbs/new.php
index 8d55cd9af..fca91fb56 100644
--- a/bbs/new.php
+++ b/bbs/new.php
@@ -20,12 +20,34 @@ else if ($view == "c")
 else
     $view = '';
 
-$mb_id = isset($_GET['mb_id']) ? ($_GET['mb_id']) : '';
-$mb_id = substr(preg_replace('#[^a-z0-9_]#i', '', $mb_id), 0, 20);
+if(isset($mb_nick) && $mb_nick){    // 닉네임으로 요청한 경우
+    $mb_nick = get_search_string(strip_tags($mb_nick));
 
-if ($mb_id) {
-    $sql_common .= " and a.mb_id = '{$mb_id}' ";
+    $sql = "select mb_id from `{$gml['member_table']}` where mb_nick = '".sql_real_escape_string($mb_nick)."' ";
+    $mb = sql_fetch($sql);
+
+    if( $mb['mb_id'] ){
+        $mb_hash = get_string_encrypt($mb['mb_id']);
+    } else {
+        $sql_common .= " and 1 = 0 ";
+    }
 }
+
+$mb_id = isset($_GET['mb_id']) ? substr(preg_replace('#[^a-z0-9_]#i', '', $_GET['mb_id']), 0, 20) : '';
+$mb_hash = isset($mb_hash) ? $mb_hash : '';
+$mb_nick = isset($mb_nick) ? $mb_nick : '';
+
+if ($is_admin && $mb_id) {
+    $sql_common .= " and a.mb_id = '".$mb_id."' ";
+} else if ($mb_hash){
+    $sql_common .= " and a.mb_id = '".get_string_check_decrypt($mb_hash, 'mb_id')."' ";
+
+    if ( ! $mb_nick ){
+        $mb = get_member( get_string_check_decrypt($mb_hash, 'mb_id') );
+        $mb_nick = $mb['mb_nick'];
+    }
+}
+
 $sql_order = " order by a.bn_id desc ";
 
 $sql = " select count(*) as cnt {$sql_common} ";
@@ -108,7 +130,7 @@ for ($i=0; $row=sql_fetch_array($result); $i++) {
     $list[$i]['wr_subject'] = $row2['wr_subject'];
 }
 
-$write_pages = get_paging(G5_IS_MOBILE ? $config['cf_mobile_pages'] : $config['cf_write_pages'], $page, $total_page, "?gr_id=$gr_id&amp;view=$view&amp;mb_id=$mb_id&amp;page=");
+$write_pages = get_paging(G5_IS_MOBILE ? $config['cf_mobile_pages'] : $config['cf_write_pages'], $page, $total_page, "?gr_id=$gr_id&amp;view=$view&amp;mb_id=$mb_id&amp;mb_hash=$mb_hash&amp;page=");
 
 include_once($new_skin_path.'/new.skin.php');
 
diff --git a/bbs/profile.php b/bbs/profile.php
index c9f53b8cb..659e62608 100644
--- a/bbs/profile.php
+++ b/bbs/profile.php
@@ -7,7 +7,11 @@ if (!$member['mb_id'])
 if (!$member['mb_open'] && $is_admin != 'super' && $member['mb_id'] != $mb_id)
     alert_close('자신의 정보를 공개하지 않으면 다른분의 정보를 조회할 수 없습니다.\\n\\n정보공개 설정은 회원정보수정에서 하실 수 있습니다.');
 
-$mb = get_member($mb_id);
+$mb_id = isset($mb_id) ? $mb_id : '';
+$mb_hash = isset($mb_hash) ? $mb_hash : '';
+
+$mb = get_member(get_search_string(get_member_by_hash($mb_id, $mb_hash)));
+
 if (!$mb['mb_id'])
     alert_close('회원정보가 존재하지 않습니다.\\n\\n탈퇴하였을 수 있습니다.');
 
diff --git a/bbs/register_form.php b/bbs/register_form.php
index 2d47e3a35..97216aba6 100644
--- a/bbs/register_form.php
+++ b/bbs/register_form.php
@@ -119,12 +119,12 @@ if ($w == "") {
 include_once('./_head.php');
 
 // 회원아이콘 경로
-$mb_icon_path = G5_DATA_PATH.'/member/'.substr($member['mb_id'],0,2).'/'.$member['mb_id'].'.gif';
-$mb_icon_url  = G5_DATA_URL.'/member/'.substr($member['mb_id'],0,2).'/'.$member['mb_id'].'.gif';
+$mb_icon_path = G5_DATA_PATH.'/member/'.substr($member['mb_id'],0,2).'/'.get_mb_icon_name($member['mb_id']).'.gif';
+$mb_icon_url  = G5_DATA_URL.'/member/'.substr($member['mb_id'],0,2).'/'.get_mb_icon_name($member['mb_id']).'.gif';
 
 // 회원이미지 경로
-$mb_img_path = G5_DATA_PATH.'/member_image/'.substr($member['mb_id'],0,2).'/'.$member['mb_id'].'.gif';
-$mb_img_url  = G5_DATA_URL.'/member_image/'.substr($member['mb_id'],0,2).'/'.$member['mb_id'].'.gif';
+$mb_img_path = G5_DATA_PATH.'/member_image/'.substr($member['mb_id'],0,2).'/'.get_mb_icon_name($member['mb_id']).'.gif';
+$mb_img_url  = G5_DATA_URL.'/member_image/'.substr($member['mb_id'],0,2).'/'.get_mb_icon_name($member['mb_id']).'.gif';
 
 $register_action_url = G5_HTTPS_BBS_URL.'/register_form_update.php';
 $req_nick = !isset($member['mb_nick_date']) || (isset($member['mb_nick_date']) && $member['mb_nick_date'] <= date("Y-m-d", G5_SERVER_TIME - ($config['cf_nick_modify'] * 86400)));
diff --git a/bbs/register_form_update.php b/bbs/register_form_update.php
index adef53779..8f79a566c 100644
--- a/bbs/register_form_update.php
+++ b/bbs/register_form_update.php
@@ -368,7 +368,7 @@ $mb_dir = G5_DATA_PATH.'/member/'.substr($mb_id,0,2);
 
 // 아이콘 삭제
 if (isset($_POST['del_mb_icon'])) {
-    @unlink($mb_dir.'/'.$mb_id.'.gif');
+    @unlink($mb_dir.'/'.get_mb_icon_name($mb_id).'.gif');
 }
 
 $msg = "";
@@ -376,7 +376,7 @@ $msg = "";
 // 아이콘 업로드
 $mb_icon = '';
 $image_regex = "/(\.(gif|jpe?g|png))$/i";
-$mb_icon_img = $mb_id.'.gif';
+$mb_icon_img = get_mb_icon_name($mb_id).'.gif';
 
 if (isset($_FILES['mb_icon']) && is_uploaded_file($_FILES['mb_icon']['tmp_name'])) {
     if (preg_match($image_regex, $_FILES['mb_icon']['name'])) {
diff --git a/extend/g5_54version_update.extend.php b/extend/g5_54version_update.extend.php
new file mode 100644
index 000000000..aaadf53ac
--- /dev/null
+++ b/extend/g5_54version_update.extend.php
@@ -0,0 +1,27 @@
+<?php
+if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
+
+put_event('member_login_check', 'g54_userlogin_after', 10, 2);
+
+// 5.3 버전에서 
+function g54_userlogin_after($mb, $link){
+    global $g5;
+
+    if(isset($mb['mb_id']) && $mb['mb_id']){
+
+        $mb_img_paths = array(G5_DATA_PATH.'/member/'.substr($mb['mb_id'], 0, 2).'/', G5_DATA_PATH.'/member_image/'.substr($mb['mb_id'], 0, 2).'/');
+        
+        $mb_id = $mb['mb_id'];
+
+        foreach( $mb_img_paths as $path ){
+            $before_file = $path.$mb_id.'.gif';
+            $after_file = $path.get_mb_icon_name($mb_id).'.gif';
+            
+            // 회원 아이콘 또는 프로필 파일 이름을 변경
+            if( ($before_file !== $after_file) && file_exists($before_file) && ! file_exists($after_file) ){
+                @rename($before_file, $after_file);
+            }
+        }
+    }
+}
+?>
\ No newline at end of file
diff --git a/install/gnuboard5.sql b/install/gnuboard5.sql
index c820c6375..5042bbc1f 100644
--- a/install/gnuboard5.sql
+++ b/install/gnuboard5.sql
@@ -515,12 +515,17 @@ CREATE TABLE IF NOT EXISTS `g5_member` (
 
 DROP TABLE IF EXISTS `g5_memo`;
 CREATE TABLE IF NOT EXISTS `g5_memo` (
-  `me_id` int(11) NOT NULL default '0',
+  `me_id` INT(11) NOT NULL AUTO_INCREMENT,
   `me_recv_mb_id` varchar(20) NOT NULL default '',
   `me_send_mb_id` varchar(20) NOT NULL default '',
   `me_send_datetime` datetime NOT NULL default '0000-00-00 00:00:00',
   `me_read_datetime` datetime NOT NULL default '0000-00-00 00:00:00',
   `me_memo` text NOT NULL,
+  `me_send_id` INT(11) NOT NULL DEFAULT '0',
+  `me_type` ENUM('send','receive') NOT NULL DEFAULT 'receive',
+  `me_readed` TINYINT(4) NOT NULL DEFAULT '0',
+  `me_send_ip` VARCHAR(100) NOT NULL DEFAULT '',
+  `me_memo` text NOT NULL,
   PRIMARY KEY  (`me_id`),
   KEY `me_recv_mb_id` (`me_recv_mb_id`)
 ) ENGINE=MyISAM DEFAULT CHARSET=utf8;
diff --git a/lib/common.lib.php b/lib/common.lib.php
index aeb72a309..846d15472 100644
--- a/lib/common.lib.php
+++ b/lib/common.lib.php
@@ -598,7 +598,7 @@ function html_purifier($html)
 
 
 // 검색 구문을 얻는다.
-function get_sql_search($search_ca_name, $search_field, $search_text, $search_operator='and')
+function get_sql_search($search_ca_name, $search_field, $search_text, $search_operator='and', $mb_hashkey='')
 {
     global $g5;
 
@@ -609,7 +609,7 @@ function get_sql_search($search_ca_name, $search_field, $search_text, $search_op
     $search_text = strip_tags(($search_text));
     $search_text = trim(stripslashes($search_text));
 
-    if (!$search_text && $search_text !== '0') {
+    if (!$search_text && $search_text !== '0' && !$mb_hashkey) {
         if ($search_ca_name) {
             return $str;
         } else {
@@ -657,6 +657,11 @@ function get_sql_search($search_ca_name, $search_field, $search_text, $search_op
             $str .= $op2;
             switch ($field[$k]) {
                 case "mb_id" :
+                    if( $is_admin ){
+                        $str .= " $field[$k] = '$s[$i]' ";
+                        $mb_hashkey = '';
+                    }
+                    break;
                 case "wr_name" :
                     $str .= " $field[$k] = '$s[$i]' ";
                     break;
@@ -687,6 +692,12 @@ function get_sql_search($search_ca_name, $search_field, $search_text, $search_op
 
         $op1 = " $search_operator ";
     }
+
+    if ($mb_hashkey){
+        $str .= (preg_match('/[a-z]/i', $str) ? " $search_operator" : '' )." mb_id = '".get_string_check_decrypt($mb_hashkey, 'mb_id')."' ";
+        $not_comment = 1;
+    }
+
     $str .= " ) ";
     if ($not_comment)
         $str .= " and wr_is_comment = '0' ";
@@ -844,12 +855,19 @@ function is_admin($mb_id)
 {
     global $config, $group, $board;
 
-    if (!$mb_id) return;
+    if (!$mb_id) return '';
 
-    if ($config['cf_admin'] == $mb_id) return 'super';
-    if (isset($group['gr_admin']) && ($group['gr_admin'] == $mb_id)) return 'group';
-    if (isset($board['bo_admin']) && ($board['bo_admin'] == $mb_id)) return 'board';
-    return '';
+    $is_authority = '';
+
+    if ($config['cf_admin'] == $mb_id){
+        $is_authority = 'super';
+    } else if (isset($group['gr_admin']) && ($group['gr_admin'] == $mb_id)){
+        $is_authority = 'group';
+    } else if (isset($board['bo_admin']) && ($board['bo_admin'] == $mb_id)){
+        $is_authority = 'board';
+    }
+
+    return apply_replace('is_admin', $is_authority, $mb_id);
 }
 
 
@@ -1263,8 +1281,7 @@ function get_sideview($mb_id, $name='', $email='', $homepage='')
     global $g5;
     global $bo_table, $sca, $is_admin, $member;
 
-    $email_enc = new str_encrypt();
-    $email = $email_enc->encrypt($email);
+    $email = get_string_encrypt($email);
     $homepage = set_http(clean_xss_tags($homepage));
 
     $name     = get_text($name, 0, true);
@@ -1272,18 +1289,27 @@ function get_sideview($mb_id, $name='', $email='', $homepage='')
     $homepage = get_text($homepage);
 
     $tmp_name = "";
+    $en_mb_id = $mb_id;
+
+    if( $is_admin ){
+        $mb_params = 'mb_id='.$mb_id;
+    } else {
+        $en_mb_id = get_string_encrypt($mb_id);
+        $mb_params = 'mb_hash='.$en_mb_id;
+    }
+
     if ($mb_id) {
         //$tmp_name = "<a href=\"".G5_BBS_URL."/profile.php?mb_id=".$mb_id."\" class=\"sv_member\" title=\"$name 자기소개\" rel="nofollow" target=\"_blank\" onclick=\"return false;\">$name</a>";
         $tmp_name = '<a href="'.G5_BBS_URL.'/profile.php?mb_id='.$mb_id.'" class="sv_member" title="'.$name.' 자기소개" target="_blank" rel="nofollow" onclick="return false;">';
 
         if ($config['cf_use_member_icon']) {
             $mb_dir = substr($mb_id,0,2);
-            $icon_file = G5_DATA_PATH.'/member/'.$mb_dir.'/'.$mb_id.'.gif';
+            $icon_file = G5_DATA_PATH.'/member/'.$mb_dir.'/'.get_mb_icon_name($mb_id).'.gif';
 
             if (file_exists($icon_file)) {
                 $width = $config['cf_member_icon_width'];
                 $height = $config['cf_member_icon_height'];
-                $icon_file_url = G5_DATA_URL.'/member/'.$mb_dir.'/'.$mb_id.'.gif';
+                $icon_file_url = G5_DATA_URL.'/member/'.$mb_dir.'/'.get_mb_icon_name($mb_id).'.gif';
                 $tmp_name .= '<span class="profile_img"><img src="'.$icon_file_url.'" width="'.$width.'" height="'.$height.'" alt=""></span>';
 
                 if ($config['cf_use_member_icon'] == 2) // 회원아이콘+이름
@@ -1316,21 +1342,26 @@ function get_sideview($mb_id, $name='', $email='', $homepage='')
 
     $str2 = "<span class=\"sv\">\n";
     if($mb_id)
-        $str2 .= "<a href=\"".G5_BBS_URL."/memo_form.php?me_recv_mb_id=".$mb_id."\" onclick=\"win_memo(this.href); return false;\">쪽지보내기</a>\n";
+        $str2 .= "<a href=\"".G5_BBS_URL."/memo_form.php?".$mb_params."\" onclick=\"win_memo(this.href); return false;\">쪽지보내기</a>\n";
     if($email)
-        $str2 .= "<a href=\"".G5_BBS_URL."/formmail.php?mb_id=".$mb_id."&amp;name=".urlencode($name)."&amp;email=".$email."\" onclick=\"win_email(this.href); return false;\">메일보내기</a>\n";
+        $str2 .= "<a href=\"".G5_BBS_URL."/formmail.php?".$mb_params."&amp;name=".urlencode($name)."&amp;email=".$email."\" onclick=\"win_email(this.href); return false;\">메일보내기</a>\n";
     if($homepage)
         $str2 .= "<a href=\"".$homepage."\" target=\"_blank\">홈페이지</a>\n";
     if($mb_id)
-        $str2 .= "<a href=\"".G5_BBS_URL."/profile.php?mb_id=".$mb_id."\" onclick=\"win_profile(this.href); return false;\">자기소개</a>\n";
+        $str2 .= "<a href=\"".G5_BBS_URL."/profile.php?".$mb_params."\" onclick=\"win_profile(this.href); return false;\">자기소개</a>\n";
     if($bo_table) {
-        if($mb_id)
-            $str2 .= "<a href=\"".get_pretty_url($bo_table, '', "sca=".$sca."&amp;sfl=mb_id,1&amp;stx=".$mb_id)."\">아이디로 검색</a>\n";
-        else
+        if($mb_id) {
+            if( $is_admin ){
+                $str2 .= "<a href=\"".get_pretty_url($bo_table, '', "sca=".$sca."&amp;sfl=mb_id,1&amp;stx=".$en_mb_id)."\">아이디로 검색</a>\n";
+            } else {
+                $str2 .= "<a href=\"".get_pretty_url($bo_table, '', "sca=".$sca."&amp;".$mb_params)."\">아이디로 검색</a>\n";
+            }
+        } else {
             $str2 .= "<a href=\"".get_pretty_url($bo_table, '', "sca=".$sca."&amp;sfl=wr_name,1&amp;stx=".$name)."\">이름으로 검색</a>\n";
+        }
     }
     if($mb_id)
-        $str2 .= "<a href=\"".G5_BBS_URL."/new.php?mb_id=".$mb_id."\" class=\"link_new_page\" onclick=\"check_goto_new(this.href, event);\">전체게시물</a>\n";
+        $str2 .= "<a href=\"".G5_BBS_URL."/new.php?".$mb_params."\" class=\"link_new_page\" onclick=\"check_goto_new(this.href, event);\">전체게시물</a>\n";
     if($is_admin == "super" && $mb_id) {
         $str2 .= "<a href=\"".G5_ADMIN_URL."/member_form.php?w=u&amp;mb_id=".$mb_id."\" target=\"_blank\">회원정보변경</a>\n";
         $str2 .= "<a href=\"".G5_ADMIN_URL."/point_list.php?sfl=mb_id&amp;stx=".$mb_id."\" target=\"_blank\">포인트내역</a>\n";
diff --git a/mobile/skin/member/basic/memo_form.skin.php b/mobile/skin/member/basic/memo_form.skin.php
index 66fc1b0ed..6a33bb96c 100644
--- a/mobile/skin/member/basic/memo_form.skin.php
+++ b/mobile/skin/member/basic/memo_form.skin.php
@@ -18,9 +18,9 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
         <h2 class="sound_only">쪽지쓰기</h2>
         <ul>
             <li>
-                <label for="me_recv_mb_id" class="sound_only">받는 회원아이디<strong>필수</strong></label>
+                <label for="me_recv_mb_nicks" class="sound_only">받는 회원닉네임<strong>필수</strong></label>
                 
-                <input type="text" name="me_recv_mb_id" value="<?php echo $me_recv_mb_id ?>" id="me_recv_mb_id" required class="frm_input required" placeholder="받는 회원아이디">
+                <input type="text" name="me_recv_mb_nicks" value="<?php echo $me_recv_mb_nicks; ?>" id="me_recv_mb_nicks" required class="frm_input full_input required" size="47" placeholder="받는 회원닉네임">
                 <span class="frm_info">여러 회원에게 보낼때는 컴마(,)로 구분하세요.</span>
                 <?php if ($config['cf_memo_send_point']) { ?>
                 <br ><span class="frm_info">쪽지 보낼때 회원당 <?php echo number_format($config['cf_memo_send_point']); ?>점의 포인트를 차감합니다.</span>
diff --git a/mobile/skin/member/basic/memo_view.skin.php b/mobile/skin/member/basic/memo_view.skin.php
index 3e8c03a4d..2f4e91841 100644
--- a/mobile/skin/member/basic/memo_view.skin.php
+++ b/mobile/skin/member/basic/memo_view.skin.php
@@ -43,7 +43,7 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
         </article>
 
         <div class="win_btn">
-            <?php if ($kind == 'recv') { ?><a href="./memo_form.php?me_recv_mb_id=<?php echo $mb['mb_id'] ?>&amp;me_id=<?php echo $memo['me_id'] ?>" class="btn_submit">답장</a><?php } ?>
+            <?php if ($kind == 'recv') { ?><a href="./memo_form.php?mb_hash=<?php echo get_string_encrypt($mb['mb_id']); ?>&amp;me_id=<?php echo $memo['me_id'] ?>" class="btn_submit">답장</a><?php } ?>
             <?php if($prev_link) { ?>
             <a href="<?php echo $prev_link ?>" class="btn_b03 btn">이전쪽지</a>
             <?php } ?>
diff --git a/skin/member/basic/memo_form.skin.php b/skin/member/basic/memo_form.skin.php
index 67693cb95..7c2874c17 100644
--- a/skin/member/basic/memo_form.skin.php
+++ b/skin/member/basic/memo_form.skin.php
@@ -20,9 +20,9 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
             <h2 class="sound_only">쪽지쓰기</h2>
             <ul>
                 <li>
-                    <label for="me_recv_mb_id" class="sound_only">받는 회원아이디<strong>필수</strong></label>
+                    <label for="me_recv_mb_nicks" class="sound_only">받는 회원닉네임<strong>필수</strong></label>
                     
-                    <input type="text" name="me_recv_mb_id" value="<?php echo $me_recv_mb_id ?>" id="me_recv_mb_id" required class="frm_input full_input required" size="47" placeholder="받는 회원아이디">
+                    <input type="text" name="me_recv_mb_nicks" value="<?php echo $me_recv_mb_nicks; ?>" id="me_recv_mb_nicks" required class="frm_input full_input required" size="47" placeholder="받는 회원닉네임">
                     <span class="frm_info">여러 회원에게 보낼때는 컴마(,)로 구분하세요.</span>
                     <?php if ($config['cf_memo_send_point']) { ?>
                     <br ><span class="frm_info">쪽지 보낼때 회원당 <?php echo number_format($config['cf_memo_send_point']); ?>점의 포인트를 차감합니다.</span>
diff --git a/skin/member/basic/memo_view.skin.php b/skin/member/basic/memo_view.skin.php
index fe62d7a6b..ce5841502 100644
--- a/skin/member/basic/memo_view.skin.php
+++ b/skin/member/basic/memo_view.skin.php
@@ -56,7 +56,7 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
 
             <a href="<?php echo $list_link ?>" class="btn btn_b01"><i class="fa fa-list" aria-hidden="true"></i> 목록</a>
             <button type="button" onclick="window.close();" class="btn_close">창닫기</button>
-            <?php if ($kind == 'recv') {  ?><a href="./memo_form.php?me_recv_mb_id=<?php echo $mb['mb_id'] ?>&amp;me_id=<?php echo $memo['me_id'] ?>" class="btn btn_b02 reply_btn">답장</a><?php }  ?>
+            <?php if ($kind == 'recv') {  ?><a href="./memo_form.php?mb_hash=<?php echo get_string_encrypt($mb['mb_id']); ?>&amp;me_id=<?php echo $memo['me_id'] ?>" class="btn btn_b02 reply_btn">답장</a><?php }  ?>
         </div>
     </div>
 </div>
diff --git a/theme/basic/mobile/skin/member/basic/memo_form.skin.php b/theme/basic/mobile/skin/member/basic/memo_form.skin.php
index 66fc1b0ed..6a33bb96c 100644
--- a/theme/basic/mobile/skin/member/basic/memo_form.skin.php
+++ b/theme/basic/mobile/skin/member/basic/memo_form.skin.php
@@ -18,9 +18,9 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
         <h2 class="sound_only">쪽지쓰기</h2>
         <ul>
             <li>
-                <label for="me_recv_mb_id" class="sound_only">받는 회원아이디<strong>필수</strong></label>
+                <label for="me_recv_mb_nicks" class="sound_only">받는 회원닉네임<strong>필수</strong></label>
                 
-                <input type="text" name="me_recv_mb_id" value="<?php echo $me_recv_mb_id ?>" id="me_recv_mb_id" required class="frm_input required" placeholder="받는 회원아이디">
+                <input type="text" name="me_recv_mb_nicks" value="<?php echo $me_recv_mb_nicks; ?>" id="me_recv_mb_nicks" required class="frm_input full_input required" size="47" placeholder="받는 회원닉네임">
                 <span class="frm_info">여러 회원에게 보낼때는 컴마(,)로 구분하세요.</span>
                 <?php if ($config['cf_memo_send_point']) { ?>
                 <br ><span class="frm_info">쪽지 보낼때 회원당 <?php echo number_format($config['cf_memo_send_point']); ?>점의 포인트를 차감합니다.</span>
diff --git a/theme/basic/mobile/skin/member/basic/memo_view.skin.php b/theme/basic/mobile/skin/member/basic/memo_view.skin.php
index 3e8c03a4d..2f4e91841 100644
--- a/theme/basic/mobile/skin/member/basic/memo_view.skin.php
+++ b/theme/basic/mobile/skin/member/basic/memo_view.skin.php
@@ -43,7 +43,7 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
         </article>
 
         <div class="win_btn">
-            <?php if ($kind == 'recv') { ?><a href="./memo_form.php?me_recv_mb_id=<?php echo $mb['mb_id'] ?>&amp;me_id=<?php echo $memo['me_id'] ?>" class="btn_submit">답장</a><?php } ?>
+            <?php if ($kind == 'recv') { ?><a href="./memo_form.php?mb_hash=<?php echo get_string_encrypt($mb['mb_id']); ?>&amp;me_id=<?php echo $memo['me_id'] ?>" class="btn_submit">답장</a><?php } ?>
             <?php if($prev_link) { ?>
             <a href="<?php echo $prev_link ?>" class="btn_b03 btn">이전쪽지</a>
             <?php } ?>
diff --git a/theme/basic/skin/member/basic/memo_form.skin.php b/theme/basic/skin/member/basic/memo_form.skin.php
index 67693cb95..7c2874c17 100644
--- a/theme/basic/skin/member/basic/memo_form.skin.php
+++ b/theme/basic/skin/member/basic/memo_form.skin.php
@@ -20,9 +20,9 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
             <h2 class="sound_only">쪽지쓰기</h2>
             <ul>
                 <li>
-                    <label for="me_recv_mb_id" class="sound_only">받는 회원아이디<strong>필수</strong></label>
+                    <label for="me_recv_mb_nicks" class="sound_only">받는 회원닉네임<strong>필수</strong></label>
                     
-                    <input type="text" name="me_recv_mb_id" value="<?php echo $me_recv_mb_id ?>" id="me_recv_mb_id" required class="frm_input full_input required" size="47" placeholder="받는 회원아이디">
+                    <input type="text" name="me_recv_mb_nicks" value="<?php echo $me_recv_mb_nicks; ?>" id="me_recv_mb_nicks" required class="frm_input full_input required" size="47" placeholder="받는 회원닉네임">
                     <span class="frm_info">여러 회원에게 보낼때는 컴마(,)로 구분하세요.</span>
                     <?php if ($config['cf_memo_send_point']) { ?>
                     <br ><span class="frm_info">쪽지 보낼때 회원당 <?php echo number_format($config['cf_memo_send_point']); ?>점의 포인트를 차감합니다.</span>
diff --git a/theme/basic/skin/member/basic/memo_view.skin.php b/theme/basic/skin/member/basic/memo_view.skin.php
index fe62d7a6b..ce5841502 100644
--- a/theme/basic/skin/member/basic/memo_view.skin.php
+++ b/theme/basic/skin/member/basic/memo_view.skin.php
@@ -56,7 +56,7 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
 
             <a href="<?php echo $list_link ?>" class="btn btn_b01"><i class="fa fa-list" aria-hidden="true"></i> 목록</a>
             <button type="button" onclick="window.close();" class="btn_close">창닫기</button>
-            <?php if ($kind == 'recv') {  ?><a href="./memo_form.php?me_recv_mb_id=<?php echo $mb['mb_id'] ?>&amp;me_id=<?php echo $memo['me_id'] ?>" class="btn btn_b02 reply_btn">답장</a><?php }  ?>
+            <?php if ($kind == 'recv') {  ?><a href="./memo_form.php?mb_hash=<?php echo get_string_encrypt($mb['mb_id']); ?>&amp;me_id=<?php echo $memo['me_id'] ?>" class="btn btn_b02 reply_btn">답장</a><?php }  ?>
         </div>
     </div>
 </div>