Motorola has announced it is looking at alternatives to traditional passwords in a bid to make logging into online sites, or accessing mobile phones, more secure.
Among the ideas discussed at the D11 conference in California on Wednesday were electronic tattoos and authentication pills that people swallow.
The tattoos, developed by Massachusetts-based engineering firm MC10, contain flexible electronic circuits that are attached to the wearer's skin using a rubber stamp.
A researcher at the University of Illinois used standard CMOS semiconductor computer chip technologies to create the Biostamp.
It uses high-performance silicon and can stretch up to 200 per cent.
The Biostamp can monitor temperature, hydration and strain, among other medical statistics
The first prototypes were stuck on using an plaster-style patches.
More recent prototypes are applied directly to the skin using a rubber stamp.
It can then be covered with spray-on bandage to make it more durable and waterproof enough to wash.
Michael D. Shoesmith
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