diff --git a/06_repository/6.3_registry_auth.md b/06_repository/6.3_registry_auth.md
index bca6bb8..6ef6a75 100644
--- a/06_repository/6.3_registry_auth.md
+++ b/06_repository/6.3_registry_auth.md
@@ -74,6 +74,8 @@ $ openssl x509 -req -days 750 -in "site.csr" -sha256 \
 
 新建 `ssl` 文件夹并将 `docker.domain.com.key` `docker.domain.com.crt` `root-ca.crt` 这三个文件移入，删除其他文件。
 
+> **安全提示**：这些私钥和证书应在本地或受控部署环境中生成，不要提交进 Git 仓库。示例目录只保留占位说明，运行前请按上面的步骤重新生成。
+
 ### 6.3.2 配置私有仓库
 
 私有仓库默认的配置文件位于 `/etc/docker/registry/config.yml`，我们先在本地编辑 `config.yml`，之后挂载到容器中。
diff --git a/06_repository/demo/ssl/.gitignore b/06_repository/demo/ssl/.gitignore
new file mode 100644
index 0000000..7c9d611
--- /dev/null
+++ b/06_repository/demo/ssl/.gitignore
@@ -0,0 +1,3 @@
+*
+!.gitignore
+!README.md
diff --git a/06_repository/demo/ssl/README.md b/06_repository/demo/ssl/README.md
new file mode 100644
index 0000000..1f1a95b
--- /dev/null
+++ b/06_repository/demo/ssl/README.md
@@ -0,0 +1,5 @@
+# Generated TLS Files
+
+Run the certificate steps in section 6.3.1 to generate `docker.domain.com.key`, `docker.domain.com.crt`, and `root-ca.crt` locally before starting the demo registry.
+
+Do not commit generated private keys or certificates.
diff --git a/06_repository/demo/ssl/docker.domain.com.crt b/06_repository/demo/ssl/docker.domain.com.crt
deleted file mode 100644
index a88a837..0000000
--- a/06_repository/demo/ssl/docker.domain.com.crt
+++ /dev/null
@@ -1,35 +0,0 @@
------BEGIN CERTIFICATE-----
-MIIF/zCCA+egAwIBAgIJAMbgVbFo7I6IMA0GCSqGSIb3DQEBCwUAMHoxCzAJBgNV
-BAYTAkNOMQ8wDQYDVQQIDAZTaGFueGkxDzANBgNVBAcMBkRhdG9uZzEaMBgGA1UE
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-tuFqq66v0qsE4mCfmJrRq+Yjfgcqsg1quRpjWh9DWOGa9HUeYFkLEKOgXybxVHJQ
-ktYba34ZFfBJUMcbZRYrRH6R4zu4LpRiyiXm29F5ml9tarThDZB5g5DJ6BTEt3Zw
-+qQHsIAcmHZvJPKEZmM6883gxbGQQ1Xt7iDrp94YRXMguBMbJwEsqI7w+25BHija
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-EifwcLH+NyUNmUQH45lxaCzb+tqFlP7cbHsdPniaS4AtmBYwKNJMjcrgxnZPtfy1
-7zJA
------END CERTIFICATE-----
diff --git a/06_repository/demo/ssl/docker.domain.com.key b/06_repository/demo/ssl/docker.domain.com.key
deleted file mode 100644
index 4545ed4..0000000
--- a/06_repository/demo/ssl/docker.domain.com.key
+++ /dev/null
@@ -1,51 +0,0 @@
------BEGIN RSA PRIVATE KEY-----
-MIIJKgIBAAKCAgEA1Hbm1tZvAeC8J54pQLHTVCtrICQ8KFTLOZakPHSWox8iQ4i2
-fkZaSccvE/51LIFnCM1yyZv88ILucqitG4zvuhDG+cU8w1vRbWf3xfGCCsHyn6LK
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------END RSA PRIVATE KEY-----