If you're running Jira in Public mode, you run the risk of having automated spam bots creating user accounts on your system. To counter this, Jira provides the CAPTCHA service, where potential users will be required to type a word represented in an image into a text field. Perform the following steps to enable the CAPTCHA service:
- Browse to the Jira administration console
- Select the System tab and then the General configuration option
- Click on the Edit Settings button
- Select On for the CAPTCHA on signup field
- Click on the Update button to apply the setting
Now, when someone tries to sign up for an account, Jira will present them with a CAPTCHA challenge that must be verified before the account is created:
