There is a input form, end user can register as a regular user. off course the attacker can also write a script to input the form with spam data.
Besides a captcha verfication, is there any other method to prevent from attacking?
Thanks in advance!
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No. I dont think any way to differentiate. Even though input by user, at the end it is a program/script being executed (which is equal to automated script if inputs are hardcoded).
Here are some alternatives for captcha. I think BOA uses picture based test.