> Can you present a functioning iris with a custom retinal image behind it? It wouldn't need to be a real iris. Extant aliveness checks typically look for: ref

> Can you present a functioning iris with a custom retinal image behind it? It wouldn't need to be a real iris. Extant aliveness checks typically look for: reflections, pupil dynamics (contractions etc), frequency/resolution - these are all designed to look for digital forgeries (image on screen or paper); this leaves them open to a prosthetic model of an eye mimicking those effects (think a very sophisticated mannequin or doll's eye) backed by a generated retinal image. Ultimately (if you want to talk absolutes) as long as the scanner can't differentiate between the original and a cloned + transplanted eye, it can never be considered unbeatable :) As convoluted as all these sound, they're conceivably within the grasp of technology. It's worth remembering that many commercial scanners currently deployed don't implement any aliveness checks.