Merge branch 'hotfix/2764'

Close zendframework/zendframework#2764

src/Rand.php

@@ -152,7 +152,7 @@ public static function getString($length, $charlist = null, $strong = false)
         // charlist is empty or not provided
         if (empty($charlist)) {
             $numBytes = ceil($length * 0.75);
-            $bytes    = static::getBytes($numBytes);
+            $bytes    = static::getBytes($numBytes, $strong);
             return substr(rtrim(base64_encode($bytes), '='), 0, $length);
         }