Adding a CAPTCHA image to the DotNetNuke login can help to inhibit fraudulent login attempts.
The Captcha option has been included as an option as a part of the DotNetNuke login for many years, since version 3.
By enabling the Captcha image the aim is to block access attempts by automated website crawlers and to discourage manual login attempts by the added complexity.
DotNetNuke doesn’t distinguish between upper and lower case characters, accepting either when answering the Captcha authentication.
Enabling Login Captcha
To add the Captcha image to the DotNetNuke login navigate to the Site Settings page under the Admin Menu pages.
On this page select the User Account Settings tab.
If you wish for the captcha to be used when making a registration on the website scroll almost to the bottom the form, looking for the entry Use CAPTCHA for Registration. Ensure that the option is checked to allow the image to be included.
For further options associated with the Captcha expand the Login Settings section.
In this section there are the following options:
- Use CAPTCHA for Associating Login (openid, liveid and cardspace)
- Use CAPTCHA to Retrieve Password
Select the options which you wish to use on your website.
Captcha
Robot programs have been created which can view a form and enter the appropriate details. This allows for the potential for a brute force attempt at cracking the login for a DotNetNuke website.
Trying to gain access to a web site using so called brute force means either random or sequential characters are entered to try to crack the access.
We have all battled with trying to enter the correct characters for a captcha code, often unsuccessfully. The use of the captcha code aims to either thwart the robot or to discourage the human. Hoping that another website will prove to be more interesting.
A captcha code is an image composed of a series of characters, often distorted with a background image made up of varying colours and swirls of lines.
Reportedly some robots are now able to distinguish the characters presented on the simplified forms of the CAPTCHA images. This has lead to the use of more intricate designs and the use of mathematical sums and word puzzles.
