Independent consultancy, research and evaluation of authentication technologies for document and product security

Holograms & DOVIDs are examples of technologies that have changed security printing over the past twenty years - what are the technologies that are going to have the most impact in the next five years?  Or the next ten years?  Join me in my search for the most significant innovations and new processes - let me know what you think are the top five most important technologies are going to be:

Thank you everyone for your response so far: here are a few of the suggestions:

*add only if you would like to receive a copy of the final list of Disruptive Technologies