Konstantin Obenland

This plugin needs Jetpack by WordPress.com to be activated and its Sharing module to be enabled. 
Enter the desired Twitter usernamen in Settings -> Sharing. It will then be appended, every time a visitor shares your content on Twitter
See the <a href="https://dev.twitter.com/docs/tweet-button" title="Tweet Button" rel="nofollow ugc">Tweet Button documentation</a> for details.
<h4>Translations</h4>
I will be more than happy to update the plugin with new locales, as soon as I receive them! 
Currently available in:
<ul>
<li>English</li>
</ul>

Jetpack Twitter Via

Adds 'via @username' to the Tweet Button provided in "Jetpack by WordPress.com"

Pascal CESCATO

Stop XML-RPC Attacks protects your WordPress site from XML-RPC brute force attacks, DDoS attempts, and reconnaissance probes while maintaining compatibility with essential services like Jetpack and WooCommerce.
Features:
<ul>
<li>Three security modes: Full Disable, Guest Disable, or Selective Blocking</li>
<li>Blocks dangerous methods: system.multicall, pingback.ping, and more</li>
<li>Compatible with Jetpack and WooCommerce</li>
<li>Optional user enumeration blocking</li>
<li>Attack logging for monitoring</li>
<li>Zero configuration required – works out of the box</li>
<li>Clean, intuitive admin interface</li>
</ul>

Stop XML-RPC Attacks

Blocks dangerous XML-RPC methods while preserving Jetpack, WooCommerce, and mobile apps compatibility.

Jetpack Twitter Via vs Stop XML-RPC Attacks