Introduction
At Joomla 6.1 a 'Proof of Work CAPTCHA' plugin has been introduced.
This CAPTCHA plugin presents a math task to the user's browser that the browser can solve automatically. It's not supposed to prove that the user is human, but to prove that the user is willing to invest the necessary time to solve the task. Currently it is based on the Altcha (altcha.org) library.
To find the plugin, then on the
click on 
and then in the 
section click on 
. Next, in the search box type say 
and click on the search button 
.
This CAPTCHA plugin presents a math task to the user's browser that the browser can solve automatically. It's not supposed to prove that the user is human, but to prove that the user is willing to invest the necessary time to solve the task. Currently it is based on the Altcha (altcha.org) library.
To find the plugin, then on the
click on and then in the section click on . Next, in the search box type say and click on the search button .This shows the CAPTCHA - Proof of Work plugin details as illustrated opposite.
Now click on the 'Difficulty' pulldown. This gives a choice of 'difficulties' as shown below.
Now click on the 'Difficulty' pulldown. This gives a choice of 'difficulties' as shown below.
The setup is now complete.
ColinM, July 2019 updated August 2020, June 2023, December 2023, May 2023, July 2025, April 2026 rewrite May 2026, July 2026, Sept 2026 -AA
