Amazon.com, Inc.
Physics-based CAPTCHA

Abstract:

Disclosed are various embodiments for generating a physics-based CAPTCHA. In a physics-based CAPTCHA, an object is placed within a scene so that a visually observable change occurs to the object. The scene is animated so that the visually observable change occurs to the object. Before and after imagery can be captured and used as a challenge and a response. Incorrect responses can be generated by altering the scene or object.