diff --git a/app/Console/Commands/Test.php b/app/Console/Commands/Test.php
index fccba9fd..276dfbb3 100644
--- a/app/Console/Commands/Test.php
+++ b/app/Console/Commands/Test.php
@@ -50,7 +50,7 @@ class Test extends Command
      */
     public function handle()
     {
-        
+
     }
 
 }
diff --git a/app/Repositories/ToolRepository.php b/app/Repositories/ToolRepository.php
index 7588bc79..93250910 100644
--- a/app/Repositories/ToolRepository.php
+++ b/app/Repositories/ToolRepository.php
@@ -9,8 +9,6 @@ use Illuminate\Support\Str;
 
 class ToolRepository extends BaseRepository
 {
-    private static $encrypter;
-
     public function backupWeb(): array
     {
         $webRoot = base_path();
@@ -146,17 +144,8 @@ class ToolRepository extends BaseRepository
         return $backupResult;
     }
 
-    public function getEncrypter(): Encrypter
+    public function getEncrypter(string $key): Encrypter
     {
-        if (!is_null(self::$encrypter)) {
-            return self::$encrypter;
-        }
-        $key = nexus_env('APP_KEY');
-        $prefix = 'base64:';
-        if (Str::startsWith($key,$prefix)) {
-            $key = substr($key, strlen($prefix));
-            $key = base64_decode($key);
-        }
-        return self::$encrypter = new Encrypter($key, 'AES-256-CBC');
+        return new Encrypter($key, 'AES-256-CBC');
     }
 }
diff --git a/app/Repositories/TorrentRepository.php b/app/Repositories/TorrentRepository.php
index 5209298a..bc01cc44 100644
--- a/app/Repositories/TorrentRepository.php
+++ b/app/Repositories/TorrentRepository.php
@@ -254,15 +254,20 @@ class TorrentRepository extends BaseRepository
         return "$speed/s";
     }
 
-    public function encryptDownHash($id, $uid): string
+    public function encryptDownHash($id, $user): string
     {
+        if (!is_array($user) || empty($user['passkey']) || empty($user['id'])) {
+            $user = User::query()->findOrFail(intval($user), ['id', 'passkey'])->toArray();
+        }
+        //down hash is relative to user passkey
+        $key = md5($user['passkey'] . date('Ymd') . $user['id']);
         $toolRep = new ToolRepository();
         $payload = [
             'id' => $id,
-            'uid' => $uid,
+            'uid' => $user['id'],
             'date' => date('Ymd'),
         ];
-        return $toolRep->getEncrypter()->encrypt($payload);
+        return $toolRep->getEncrypter($key)->encrypt($payload);
     }
 
     public function decryptDownHash($downHash)
diff --git a/lang/chs/lang_details.php b/lang/chs/lang_details.php
index 2849d8e1..12d1fc4e 100644
--- a/lang/chs/lang_details.php
+++ b/lang/chs/lang_details.php
@@ -220,7 +220,7 @@ $lang_details = array
 	'text_and_more' => "……（这里只显示最新记录。共",
 	'text_users_in_total' => "个用户表示了感谢）",
     'torrent_dl_url' => "种子链接",
-    'torrent_dl_url_notice' => "可在BT客户端使用，请保护好Passkey，谨防泄露。",
+    'torrent_dl_url_notice' => "可在BT客户端使用，当天有效。",
     'torrent_dl_url_text' => "右键查看。",
     'span_description_have_given' =>'你已经赠送魔力值',
     'text_no_magic_added' => "暂无魔力值奖励",
diff --git a/lang/cht/lang_details.php b/lang/cht/lang_details.php
index b8152a2d..3bdc7da8 100644
--- a/lang/cht/lang_details.php
+++ b/lang/cht/lang_details.php
@@ -219,7 +219,7 @@ $lang_details = array
 	'text_and_more' => "……（這裏只顯示最新記錄。共",
 	'text_users_in_total' => "個用戶表示了感謝）",
     'torrent_dl_url' => "種子連結",
-    'torrent_dl_url_notice' => "可在BT用戶端使用，請保護好Passkey，謹防洩露。",
+    'torrent_dl_url_notice' => "可在BT用戶端使用，當天有效。",
     'torrent_dl_url_text' => "右鍵查看。",
     'span_description_have_given' =>'你已經贈送魔力值',
     'text_no_magic_added' => "暫無魔力值獎勵",
diff --git a/lang/en/lang_details.php b/lang/en/lang_details.php
index 7fd4c486..dc88ae7e 100644
--- a/lang/en/lang_details.php
+++ b/lang/en/lang_details.php
@@ -219,7 +219,7 @@ $lang_details = array
 	'text_and_more' => " and more (thanks from ",
 	'text_users_in_total' => " users in total)",
     'torrent_dl_url' => "Torrent URL",
-    'torrent_dl_url_notice' => "You can copy it to your BT Client. Take care since it contains your passkey.",
+    'torrent_dl_url_notice' => "You can copy it to your BT Client. Only valid in today.",
     'torrent_dl_url_text' => "Right click to view.",
     'span_description_have_given' =>'You have given the magic of the value',
     'text_no_magic_added' => "No magic value of the award",
diff --git a/public/details.php b/public/details.php
index 6c492b37..d3a6ff5f 100644
--- a/public/details.php
+++ b/public/details.php
@@ -38,6 +38,7 @@ if (!$row) {
 ) {
     permissiondenied();
 } else {
+    $torrentRep = new \App\Repositories\TorrentRepository();
     $torrentUpdate = [];
 	if (!empty($_GET["hit"])) {
         $torrentUpdate[] = 'views = views + 1';
@@ -127,7 +128,7 @@ if (!$row) {
 		else $download = "";
 
 		tr($lang_details['row_action'], $download. ($owned == 1 ? "<$editlink><img class=\"dt_edit\" src=\"pic/trans.gif\" alt=\"edit\" />&nbsp;<b><font class=\"small\">".$lang_details['text_edit_torrent'] . "</font></b></a>&nbsp;|&nbsp;" : "").  (get_user_class() >= $askreseed_class && $row['seeders'] == 0 ? "<a title=\"".$lang_details['title_ask_for_reseed']."\" href=\"takereseed.php?reseedid=$id\"><img class=\"dt_reseed\" src=\"pic/trans.gif\" alt=\"reseed\">&nbsp;<b><font class=\"small\">".$lang_details['text_ask_for_reseed'] ."</font></b></a>&nbsp;|&nbsp;" : "") . "<a title=\"".$lang_details['title_report_torrent']."\" href=\"report.php?torrent=$id\"><img class=\"dt_report\" src=\"pic/trans.gif\" alt=\"report\" />&nbsp;<b><font class=\"small\">".$lang_details['text_report_torrent']."</font></b></a>", 1);
-        tr($lang_details['torrent_dl_url'],sprintf('<a title="%s" href="%s/download.php?id=%u&passkey=%s">%s</a>',$lang_details['torrent_dl_url_notice'],getSchemeAndHttpHost(),$id,$CURUSER['passkey'], $lang_details['torrent_dl_url_text']),1);
+        tr($lang_details['torrent_dl_url'],sprintf('<a title="%s" href="%s/download.php?downhash=%s">%s</a>',$lang_details['torrent_dl_url_notice'], getSchemeAndHttpHost(), $torrentRep->encryptDownHash($row['id'], $CURUSER), $lang_details['torrent_dl_url_text']),1);
 
 		// ---------------- start subtitle block -------------------//
 		$r = sql_query("SELECT subs.*, language.flagpic, language.lang_name FROM subs LEFT JOIN language ON subs.lang_id=language.id WHERE torrent_id = " . sqlesc($row["id"]). " ORDER BY subs.lang_id ASC") or sqlerr(__FILE__, __LINE__);
diff --git a/public/download.php b/public/download.php
index 396ac5f6..a8517371 100644
--- a/public/download.php
+++ b/public/download.php
@@ -1,15 +1,25 @@
 <?php
 require_once("../include/bittorrent.php");
 dbconn();
-$id = (int)$_GET["id"];
-if (!$id)
-	httperr();
-$passkey = $_GET['passkey'] ?? '';
-if ($passkey){
-	$res = sql_query("SELECT * FROM users WHERE passkey=". sqlesc($passkey)." LIMIT 1");
+
+if (!empty($_REQUEST['downhash'])){
+    $torrentRep = new \App\Repositories\TorrentRepository();
+    try {
+        $params = $torrentRep->decryptDownHash($_REQUEST['downhash']);
+    } catch (\Exception $exception) {
+        do_log("downhash: " . $_REQUEST['downhash'] . " invalid: " . $exception->getMessage());
+        die("invalid downhash, decrypt fail");
+    }
+    if ($params['date'] != date('Ymd')) {
+        die("invalid downhash, expires");
+    }
+    $id = $params['id'];
+    $uid = $params['uid'];
+
+	$res = sql_query("SELECT * FROM users WHERE id=". sqlesc($uid)." LIMIT 1");
 	$user = mysql_fetch_array($res);
 	if (!$user)
-		die("invalid passkey");
+		die("invalid downhash, payload invalid");
 	elseif ($user['enabled'] == 'no' || $user['parked'] == 'yes')
 		die("account disabed or parked");
 	$oldip = $user['ip'];
@@ -18,6 +28,9 @@ if ($passkey){
 }
 else
 {
+    $id = (int)$_GET["id"];
+    if (!$id)
+        httperr();
 	loggedinorreturn();
 	parked();
 	$letdown = intval($_GET['letdown'] ?? 0);