This is a Rails Engine. That adds a couple of things.
This has only been tested on Rails 4.1.1
Add this line to your application's Gemfile:
gem 'obscura_linka'
# In the views
# this link href will be obscured
# It will look like: <a href='' data-href="xxux://xuxuxm.nv8vjv" class='rot_13'>my link</a>
<%= obscura_link_to('my link', root_path) %> # In the layout include obscura link to's javascripts
<%= javascript_include_tag('obscura_linka/application') %>