diff --git a/classes/Cookie.php b/classes/Cookie.php
index 09d6fbfd6..957a0525f 100644
--- a/classes/Cookie.php
+++ b/classes/Cookie.php
@@ -254,10 +254,12 @@ class CookieCore
 		{
 			/* Decrypt cookie content */
 			$content = $this->_cipherTool->decrypt($_COOKIE[$this->_name]);
-
+			//printf("\$content = %s<br />", $content);
+			
 			/* Get cookie checksum */
 			$checksum = crc32($this->_iv.substr($content, 0, strrpos($content, '¤') + 2));
-
+			//printf("\$checksum = %s<br />", $checksum);
+			
 			/* Unserialize cookie content */
 			$tmpTab = explode('¤', $content);
 			foreach ($tmpTab as $keyAndValue)
@@ -269,7 +271,8 @@ class CookieCore
 			/* Blowfish fix */
 			if (isset($this->_content['checksum']))
 				$this->_content['checksum'] = (int)($this->_content['checksum']);
-
+			//printf("\$this->_content['checksum'] = %s<br />", $this->_content['checksum']);
+			//die();
 			/* Check if cookie has not been modified */
 			if (!isset($this->_content['checksum']) || $this->_content['checksum'] != $checksum)
 				$this->logout();
diff --git a/classes/Rijndael.php b/classes/Rijndael.php
index 427f978a2..404b4371a 100644
--- a/classes/Rijndael.php
+++ b/classes/Rijndael.php
@@ -39,16 +39,27 @@ class RijndaelCore
 	// Base64 is not required, but it is be more compact than urlencode
 	public function encrypt($plaintext)
 	{
-        if (($length = strlen($plaintext)) >= 1048576)
+		$length = (ini_get('mbstring.func_overload') & 2) ? mb_strlen($plaintext, ini_get('default_charset')) : strlen($plaintext);
+
+        if ($length >= 1048576)
 			return false;
 		return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $this->_key, $plaintext, MCRYPT_MODE_ECB, $this->_iv)).sprintf('%06d', $length);
 	}
 
 	public function decrypt($ciphertext)
 	{
-		$plainTextLength = intval(substr($ciphertext, -6));
-		$ciphertext = substr($ciphertext, 0, -6);
-		return substr(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $this->_key, base64_decode($ciphertext), MCRYPT_MODE_ECB, $this->_iv), 0, $plainTextLength);
+		if (ini_get('mbstring.func_overload') & 2)
+		{
+			$plainTextLength = intval(mb_substr($ciphertext, -6, 6, ini_get('default_charset')));
+			$ciphertext = mb_substr($ciphertext, 0, -6, ini_get('default_charset'));
+			return mb_substr(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $this->_key, base64_decode($ciphertext), MCRYPT_MODE_ECB, $this->_iv), 0, $plainTextLength, ini_get('default_charset'));
+		}
+		else
+		{
+			$plainTextLength = intval(substr($ciphertext, -6));
+			$ciphertext = substr($ciphertext, 0, -6);
+			return substr(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $this->_key, base64_decode($ciphertext), MCRYPT_MODE_ECB, $this->_iv), 0, $plainTextLength);
+		}
 	}
 }