Default captcha implements generation and verification of image. A default captcha image is the sequence of digits 0-9 with the defined length(5).
Configure in Casdoor
Create a new provider in Casdoor.
Select category as Captcha , type as Default .
And you can click Preview botton to preview the style of this captcha.
Applied in application
Edit the application you want to configure in Casdoor. Select the provider just added and click the button Save.