diff --git a/core/class/template.class.php b/core/class/template.class.php
index d8f8f6d8..4ea906ab 100644
--- a/core/class/template.class.php
+++ b/core/class/template.class.php
@@ -52,7 +52,7 @@ class template {
         // Génère deux nombres pour le captcha
         $numbers = array(0,1,2,3,4,5,6,7,8,9,10,12,13,14,15,16,17,18,19,20);
         $letters = array('u','t','s','r','q','p','o','n','m','l','k','j','i','h','g','f','e','d','c','b','a');
-        $limit = $attributes['limit']  ? 9 : count($letters)-1 ;
+        $limit = $attributes['limit']  ?  count($letters)-1 : 10 ;
         $firstNumber = rand ( 0 , $limit );
         $secondNumber = rand ( 0 , $limit );
         $result =  $firstNumber +  $secondNumber;
diff --git a/core/core.php b/core/core.php
index 81709e99..d5783642 100644
--- a/core/core.php
+++ b/core/core.php
@@ -1476,6 +1476,13 @@ class common {
 			$this->setData(['config', 'connect','captcha10', false]);
 		$this->setData(['core', 'dataVersion', 10303]);
 		}
+		// Version 10.4.00
+		if ($this->getData(['core', 'dataVersion']) < 10400) {
+			// Activation par défaut du captcha à la connexion
+			$this->setData(['config', 'captchaStrong', $this->setData(['config', 'connect','captcha10'])]);
+			$this->deleteData(['config', 'connect','captcha10']);
+		$this->setData(['core', 'dataVersion', 10400]);
+		}
 	}
 }
 
diff --git a/core/module/config/config.php b/core/module/config/config.php
index b97d1481..13e474b5 100644
--- a/core/module/config/config.php
+++ b/core/module/config/config.php
@@ -470,6 +470,7 @@ class config extends common {
 					'proxyType' => $this->getInput('configProxyType'),
 					'proxyUrl' => $this->getInput('configProxyUrl'),
 					'proxyPort' => $this->getInput('configProxyPort',helper::FILTER_INT),
+					'captchaStrong' => $this->getInput('configCaptchaStrong',helper::FILTER_BOOLEAN),
 					'smtp' => [
 						'enable' => $this->getInput('configSmtpEnable',helper::FILTER_BOOLEAN),
 						'host' => $this->getInput('configSmtpHost',helper::FILTER_STRING_SHORT),
@@ -485,7 +486,6 @@ class config extends common {
 						'timeout' => $this->getInput('configConnectTimeout',helper::FILTER_INT),
 						'log' => $this->getInput('configConnectLog',helper::FILTER_BOOLEAN),
 						'captcha' => $this->getInput('configConnectCaptcha',helper::FILTER_BOOLEAN),
-						'captcha10' => $this->getInput('configConnectCaptcha10',helper::FILTER_BOOLEAN)
 					]
 				]
 			]);
diff --git a/core/module/config/view/index/index.php b/core/module/config/view/index/index.php
index 007b3d85..8ac543b0 100644
--- a/core/module/config/view/index/index.php
+++ b/core/module/config/view/index/index.php
@@ -100,9 +100,9 @@
 					]); ?>
 				</div>
 				<div class="col4 verticalAlignBottom">
-						<?php echo template::checkbox('configConnectCaptcha10', true, 'Captcha simple', [
-							'checked' => $this->getData(['config', 'connect','captcha10']),
-							'help' => 'Addition limitée aux chiffres de 0 à 9. S\'applique à tous les captchas du site.'
+						<?php echo template::checkbox('configCaptchaStrong', true, 'Captcha renforcé', [
+							'checked' => $this->getData(['config', 'captchaStrong']),
+							'help' => 'Addition de chiffres de 0 à 20.'
 						]); ?>
 					</div>
 			</div>
diff --git a/core/module/install/ressource/defaultdata.php b/core/module/install/ressource/defaultdata.php
index 03ff078d..f4e07063 100644
--- a/core/module/install/ressource/defaultdata.php
+++ b/core/module/install/ressource/defaultdata.php
@@ -16,6 +16,7 @@ class init extends common {
 			'legalPageId' => 'mentions-legales',
 			'searchPageId' => 'recherche',
 			'maintenance' => false,
+			'captchaStrong' => false,
 			'social' => [
 				'facebookId' => 'facebook',
 				'instagramId' => '',
diff --git a/core/module/user/view/login/login.php b/core/module/user/view/login/login.php
index a7219ce6..43b59702 100644
--- a/core/module/user/view/login/login.php
+++ b/core/module/user/view/login/login.php
@@ -16,7 +16,7 @@
 		<div class="row">
 			<div class="col12 textAlignCenter">
 				<?php echo template::captcha('userLoginCaptcha', [
-					'limit' => $this->getData(['config','connect','captcha10'])
+					'limit' => $this->getData(['config','captchaStrong'])
 				]); ?>
 			</div>
 		</div>
diff --git a/module/blog/view/article/article.php b/module/blog/view/article/article.php
index 51c6ec80..9f60ac47 100644
--- a/module/blog/view/article/article.php
+++ b/module/blog/view/article/article.php
@@ -98,7 +98,7 @@
 					<div class="row">
 						<div class="col12">
 							<?php echo template::captcha('blogArticleCaptcha', [
-								'limit' => $this->getData(['config','connect','captcha10'])
+								'limit' => $this->getData(['config','captchaStrong'])
 							]); ?>
 						</div>
 					</div>
diff --git a/module/form/view/index/index.php b/module/form/view/index/index.php
index 02b082e2..1a10764c 100644
--- a/module/form/view/index/index.php
+++ b/module/form/view/index/index.php
@@ -47,7 +47,7 @@
 			<div class="row">
 				<div class="col5">
 					<?php echo template::captcha('formCaptcha', [
-						'limit' => $this->getData(['config','connect','captcha10'])
+						'limit' => $this->getData(['config','captchaStrong'])
 					]); ?>
 				</div>
 			</div>