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# How to enable URL signing on a CDN pull zone

URL Signing protects your CDN endpoint content from unauthorized access, the following guide will take you through the parameters which you can control via URL Signing

### Signing options and URL Formats

A URL can be signed with any of these parameters

* _Query string format:_ http://example.com/filename?secure=FjnSIKndiNXInxkl&expires=1747605200&ip=127.0.0.1
* _Path format:_ http://example.com/secure=FjnSIKndiNXInxkl&expires=1747605200&ip=127.0.0.1/filename

| Parameter | Description                 | Type                 | Importance |
|-----------|-----------------------------|----------------------|------------|
| expires   | Expiration time of the URL  | UNIX Timestamp       | Optional   |
| filename      | Path of a file of directory | String               | Optional   |
| secure    | Generated public token      | String               | Required   |
| ip        | Allowed IP address          | IPv4 or IPv6 address | Optional   |

You can set your own URL signing key to generate the unique secure string for your CDN content. Follow the steps below;

1. Go to the **Security** tab in the Pull zone's manage page 

![](https://storage.crisp.chat/users/helpdesk/website/2d4cd5516f670e00/security-tab_1jd6h8s.png)

2. Under **URL Signing** click the **Enable** check box

3. Add your own _URL Signing Key_ and click on the **Save URL Signing Settings** button

![](https://storage.crisp.chat/users/helpdesk/website/2d4cd5516f670e00/url-s_c5ztty.png)

||| The URL signing key is similar to a password and can contain a minimum of 6 to a maximum of 32 characters.

### Code examples on URL Signing

Please [visit here](https://github.com/Cloudcone/cdn-nexus-url-signing) to view the available code examples on enabling URL Signing within your application