Rate limiting

Smart difficulty scaling

Instead of asking users to solve frustrating puzzles, Private Captcha solves an invisible cryptographic task fully in the background. Solving a task requires a certain amount of compute resources (e.g. CPU and/or GPU time) from the user. Amount of resources needed is known as "difficulty".

Automatic adjustment.

The system automatically adjusts the task difficulty depending on current access patterns to the protected resource and access patterns of the actor themselves.

Exponential growth.

Difficulty grows exponentially, with each small increase requiring much more compute resources from bots. This very quickly makes any attack economically nonviable.

LLM resistant.

Compute resource requirements to solve the task provide equal security regardless of bots intelligence level, making it effective even as AI technology improves.

In Private Captcha dashboard you can configure the base difficulty for tasks and how fast difficulty grows based on the dynamics of current access patterns. So it can be perfectly tailored for your users.