diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2f498202..f826744a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,8 +9,8 @@ CHANGELOG
 2.8.0
 -----
 
- * deprecated the `key` setting of `anonymous` and `remember_me` in favor of the
-   `secret` setting.
+ * deprecated the `key` setting of `anonymous`, `remember_me` and `http_digest`
+   in favor of the `secret` setting.
 
 2.6.0
 -----
diff --git a/DependencyInjection/Security/Factory/HttpDigestFactory.php b/DependencyInjection/Security/Factory/HttpDigestFactory.php
index 691714fa..63875f83 100644
--- a/DependencyInjection/Security/Factory/HttpDigestFactory.php
+++ b/DependencyInjection/Security/Factory/HttpDigestFactory.php
@@ -58,10 +58,26 @@ public function getKey()
     public function addConfiguration(NodeDefinition $node)
     {
         $node
+            ->beforeNormalization()
+                ->ifTrue(function ($v) { return isset($v['key']); })
+                ->then(function ($v) {
+                    if (isset($v['secret'])) {
+                        throw new \LogicException('Cannot set both key and secret options for http_digest, use only secret instead.');
+                    }
+
+                    @trigger_error('http_digest.key is deprecated since version 2.8 and will be removed in 3.0. Use http_digest.secret instead.', E_USER_DEPRECATED);
+
+                    $v['secret'] = $v['key'];
+
+                    unset($v['key']);
+
+                    return $v;
+                })
+            ->end()
             ->children()
                 ->scalarNode('provider')->end()
                 ->scalarNode('realm')->defaultValue('Secured Area')->end()
-                ->scalarNode('key')->isRequired()->cannotBeEmpty()->end()
+                ->scalarNode('secret')->isRequired()->cannotBeEmpty()->end()
             ->end()
         ;
     }
@@ -76,7 +92,7 @@ protected function createEntryPoint($container, $id, $config, $defaultEntryPoint
         $container
             ->setDefinition($entryPointId, new DefinitionDecorator('security.authentication.digest_entry_point'))
             ->addArgument($config['realm'])
-            ->addArgument($config['key'])
+            ->addArgument($config['secret'])
         ;
 
         return $entryPointId;
diff --git a/Tests/DependencyInjection/Fixtures/php/container1.php b/Tests/DependencyInjection/Fixtures/php/container1.php
index 4789a6d3..fc9b07c4 100644
--- a/Tests/DependencyInjection/Fixtures/php/container1.php
+++ b/Tests/DependencyInjection/Fixtures/php/container1.php
@@ -64,7 +64,7 @@
         'simple' => array('pattern' => '/login', 'security' => false),
         'secure' => array('stateless' => true,
             'http_basic' => true,
-            'http_digest' => array('key' => 'TheKey'),
+            'http_digest' => array('secret' => 'TheSecret'),
             'form_login' => true,
             'anonymous' => true,
             'switch_user' => true,
diff --git a/Tests/DependencyInjection/Fixtures/xml/container1.xml b/Tests/DependencyInjection/Fixtures/xml/container1.xml
index 61873a9f..19167551 100644
--- a/Tests/DependencyInjection/Fixtures/xml/container1.xml
+++ b/Tests/DependencyInjection/Fixtures/xml/container1.xml
@@ -49,7 +49,7 @@
 
         <firewall name="secure" stateless="true">
             <http-basic />
-            <http-digest key="TheKey" />
+            <http-digest secret="TheSecret" />
             <form-login />
             <anonymous />
             <switch-user />
diff --git a/Tests/DependencyInjection/Fixtures/yml/container1.yml b/Tests/DependencyInjection/Fixtures/yml/container1.yml
index e14e7931..e8ed61ef 100644
--- a/Tests/DependencyInjection/Fixtures/yml/container1.yml
+++ b/Tests/DependencyInjection/Fixtures/yml/container1.yml
@@ -47,7 +47,7 @@ security:
             stateless: true
             http_basic: true
             http_digest:
-                key: TheKey
+                secret: TheSecret
             form_login: true
             anonymous: true
             switch_user: true