diff --git a/adm/config_form.php b/adm/config_form.php
index 02da0575d..aaec76ca8 100644
--- a/adm/config_form.php
+++ b/adm/config_form.php
@@ -1282,7 +1282,10 @@ if($config['cf_cert_use']) {
 
     // kcp일 때
     if($config['cf_cert_hp'] == 'kcp') {
-        $exe = G5_KCPCERT_PATH.'/bin/ct_cli';
+        if(PHP_INT_MAX == 2147483647) // 32-bit
+            $exe = G5_KCPCERT_PATH . '/bin/ct_cli';
+        else
+            $exe = G5_KCPCERT_PATH . '/bin/ct_cli_x64';
 
         echo module_exec_check($exe, 'ct_cli');
     }
diff --git a/perms.sh b/perms.sh
index 6542ef41b..8719b01c4 100644
--- a/perms.sh
+++ b/perms.sh
@@ -2,6 +2,7 @@
 
 # kcp 본인확인 실행 파일
 chmod 755 plugin/kcpcert/bin/ct_cli
+chmod 755 plugin/kcpcert/bin/ct_cli_x64
 
 # okname 본인확인 실행 파일
 chmod 755 plugin/okname/bin/okname
diff --git a/plugin/kcpcert/bin/ct_cli_x64 b/plugin/kcpcert/bin/ct_cli_x64
new file mode 100755
index 000000000..4fc53b04d
Binary files /dev/null and b/plugin/kcpcert/bin/ct_cli_x64 differ
diff --git a/plugin/kcpcert/kcpcert_result.php b/plugin/kcpcert/kcpcert_result.php
index e18c9d1ff..255122187 100644
--- a/plugin/kcpcert/kcpcert_result.php
+++ b/plugin/kcpcert/kcpcert_result.php
@@ -101,8 +101,12 @@ if( $cert_enc_use == "Y" )
         if ( $ct_cert->check_valid_hash ( $home_dir , $dn_hash , $veri_str ) != "1" )
         {
             // 검증 실패시 처리 영역
+            if(PHP_INT_MAX == 2147483647) // 32-bit
+                $bin_exe = '/bin/ct_cli';
+            else
+                $bin_exe = '/bin/ct_cli_x64';
 
-            echo "dn_hash 변조 위험있음 (".G5_KCPCERT_PATH."/bin/ct_cli 파일에 실행권한이 있는지 확인하세요.)";
+            echo "dn_hash 변조 위험있음 (".G5_KCPCERT_PATH.$bin_exe." 파일에 실행권한이 있는지 확인하세요.)";
             exit;
             // 오류 처리 ( dn_hash 변조 위험있음)
         }
diff --git a/plugin/kcpcert/lib/ct_cli_lib.php b/plugin/kcpcert/lib/ct_cli_lib.php
index dc40539d2..32a77d5cf 100644
--- a/plugin/kcpcert/lib/ct_cli_lib.php
+++ b/plugin/kcpcert/lib/ct_cli_lib.php
@@ -16,19 +16,19 @@ class   C_CT_CLI
     // 변수 초기화 영역
     function mf_clear()
     {
-        $this->m_dec_data="";        
+        $this->m_dec_data="";
     }
 
     // hash 처리 영역
     function make_hash_data( $home_dir , $str )
     {
-        $hash_data = $this -> mf_exec( $home_dir . "/bin/ct_cli" , 
+        $hash_data = $this -> mf_exec( $home_dir . "/bin/ct_cli" ,
                                        "lf_CT_CLI__make_hash_data",
                                        $str
                                      );
 
         if ( $hash_data == "" ) { $hash_data = "HS01"; }
-        
+
         return $hash_data;
     }
 
@@ -49,7 +49,12 @@ class   C_CT_CLI
     // 암호화 인증데이터 복호화
     function decrypt_enc_cert ( $home_dir, $site_cd , $cert_no , $enc_cert_data , $opt)
     {
-        $dec_data = $this -> mf_exec( $home_dir . "/bin/ct_cli" ,
+        if(PHP_INT_MAX == 2147483647) // 32-bit
+            $bin_exe = $home_dir . '/bin/ct_cli';
+        else
+            $bin_exe = $home_dir . '/bin/ct_cli_x64';
+
+        $dec_data = $this -> mf_exec( $bin_exe ,
                                      "lf_CT_CLI__decrypt_enc_cert" ,
                                       $site_cd ,
                                       $cert_no ,