diff --git a/Generator/ImageBuilder.php b/Generator/CaptchaBuilder.php
similarity index 99%
rename from Generator/ImageBuilder.php
rename to Generator/CaptchaBuilder.php
index f94006d..f016607 100644
--- a/Generator/ImageBuilder.php
+++ b/Generator/CaptchaBuilder.php
@@ -11,7 +11,7 @@ use Symfony\Component\Finder\Finder;
  * @author Gregwar <g.passault@gmail.com>
  * @author Jeremy Livingston <jeremy.j.livingston@gmail.com>
  */
-class ImageBuilder
+class CaptchaBuilder
 {
     /**
      * @var array
diff --git a/Generator/CaptchaGenerator.php b/Generator/CaptchaGenerator.php
index 5801be6..8b98328 100644
--- a/Generator/CaptchaGenerator.php
+++ b/Generator/CaptchaGenerator.php
@@ -31,10 +31,15 @@ class CaptchaGenerator
     protected $router;
 
     /**
-     * @var ImageBuilder
+     * @var CaptchaBuilder
      */
     protected $builder;
 
+    /**
+     * @var PhraseBuilder
+     */
+    protected $phraseBuilder;
+
     /**
      * @var ImageFileHandler
      */
@@ -43,15 +48,16 @@ class CaptchaGenerator
     /**
      * @param \Symfony\Component\HttpFoundation\Session\SessionInterface $session
      * @param \Symfony\Component\Routing\RouterInterface $router
-     * @param ImageBuilder $builder
+     * @param CaptchaBuilder $builder
      * @param ImageFileHandler $imageFileHandler
      * @param string $whitelistKey
      */
-    public function __construct(SessionInterface $session, RouterInterface $router, ImageBuilder $builder, ImageFileHandler $imageFileHandler, $whitelistKey)
+    public function __construct(SessionInterface $session, RouterInterface $router, CaptchaBuilder $builder, PhraseBuilder $phraseBuilder, ImageFileHandler $imageFileHandler, $whitelistKey)
     {
         $this->session          = $session;
         $this->router           = $router;
         $this->builder          = $builder;
+        $this->phraseBuilder    = $phraseBuilder;
         $this->imageFileHandler = $imageFileHandler;
         $this->whitelistKey     = $whitelistKey;
     }
@@ -131,13 +137,7 @@ class CaptchaGenerator
             return $this->session->get($key);
         }
 
-        $phrase = '';
-        $chars = str_split($options['charset']);
-
-        for ($i = 0; $i < $options['length']; $i++) {
-            $phrase .= $chars[array_rand($chars)];
-        }
-
+        $phrase = $this->phraseBuilder->build($options['length'], $options['charset']);
         $this->session->set($key, $phrase);
 
         return $phrase;
diff --git a/Generator/PhraseBuilder.php b/Generator/PhraseBuilder.php
new file mode 100644
index 0000000..d7418f2
--- /dev/null
+++ b/Generator/PhraseBuilder.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace Gregwar\CaptchaBundle\Generator;
+
+use Symfony\Component\Finder\Finder;
+use Symfony\Component\HttpFoundation\Session\SessionInterface;
+use Symfony\Component\Routing\RouterInterface;
+
+/**
+ * Generates random phrase
+ *
+ * @author Gregwar <g.passault@gmail.com>
+ */
+class PhraseBuilder
+{
+    public function build($length = 5, $charset = 'abcdefghijklmnopqrstuvwxyz0123456789')
+    {
+        $phrase = '';
+        $chars = str_split($charset);
+
+        for ($i = 0; $i < $length; $i++) {
+            $phrase .= $chars[array_rand($chars)];
+        }
+
+        return $phrase;
+    }
+}
diff --git a/Resources/config/services.yml b/Resources/config/services.yml
index ea44ce4..eced814 100755
--- a/Resources/config/services.yml
+++ b/Resources/config/services.yml
@@ -13,7 +13,8 @@ services:
         arguments:
             - @session
             - @router
-            - @gregwar_captcha.image_builder
+            - @gregwar_captcha.captcha_builder
+            - @gregwar_captcha.phrase_builder
             - @gregwar_captcha.image_file_handler
             - %gregwar_captcha.config.whitelist_key%
 
@@ -25,5 +26,8 @@ services:
             - %gregwar_captcha.config.gc_freq%
             - %gregwar_captcha.config.expiration%
 
-    gregwar_captcha.image_builder:
-        class: Gregwar\CaptchaBundle\Generator\ImageBuilder
+    gregwar_captcha.captcha_builder:
+        class: Gregwar\CaptchaBundle\Generator\CaptchaBuilder
+
+    gregwar_captcha.phrase_builder:
+        class: Gregwar\CaptchaBundle\Generator\PhraseBuilder