alexisabarca

With this very simple plugin you can use the blog URL to authenticate with OpenID using an another OpenID provider. 
called Delegation.
In order to maximize performance the vars are contained in plugin file rather than storing in a database.
Due to security issue (https://wordpress.org/news/2011/06/passwords-reset/) php file is gpg signed, ID 7ED1BC0C.

Open ID Delegate

This plugin adds the necessary tags to be able to use your blog URL as OpenID address using another OpenID provider

ider

With this plugin you can provide login and registration process using the IDer Service. 
An additional “Login with IDer” button will appears along the regular one.
How it works? 
1. First of all you need to create a profile in the <a href="http://ider.com/" title="IDer website" rel="nofollow ugc">IDer</a> website 
2. Clicking the button a redirect to the IDer server will display a QR Code 
3. To scan it you need to download the free IDer App from the App Store or Google Play depending which cell phone you own. 
 Or just scan the QR code with any QR Code reader and you will be redirect to the download page. 
 Provide few infos and you are ready to scan the QR code 
4. After that the IDer App will prompt you for the missing data required to complete the login/registration process. 
 Confirming the data your browser will automatically log you in and show you which info the website saved.

IDer Login for WordPress

This plugin provides functionality to register and connect to your WordPress via IDer Service.

Open ID Delegate vs IDer Login for WordPress