Develop a ML Model based solution to refine CAPTCHA.

Source summary

Develop a largely passive alternative to CAPTCHA for UIDAI portals, using browser environmental signals and a backend ML model to distinguish human use from bots. Permit a small number of user interactions only when passive analysis is insufficient. Provide JavaScript-compatible frontend capture, a pluggable backend model and working code for both, while following UIDAI privacy policies. Protection of backend APIs from denial-of-service abuse is the intended use.