phpBB custom registration to deter bots from registering

Avg Bid (USD)
Project Budget (USD)
$30 - $120

Project Description:
My phpBB v 3.05 forum is being plagued by bot registrations (10s a day). I need a custom security check/addition to the registration process to help stop bot registrations.

1. the addition needs to work with current version of the board

2. the addition will have to be checked to ensure it does not affect normal registrations

3. needs to be something that can be easily updated if bots find a way around it - something I can possibly change on the fly without any knowledge of php or coding

4. payment will be made after a week of no bot registrations, following the addition of the security feature.

5. the addition of the security check needs to look tidy and fit in with the html on the current registration page.

6. I want a reliable person who knows how to handle this issue efficiently and effectively.

7. cant use a mod that is freely available to other users - this needs to be custom for our board only.

Skills required:
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