Motorola have come up with a solution for remembering all those passwords for all those tablets, smartphones and apps, foreign media report.

Motorola Mobility's head of advanced technology and projects group, Regina Dugan, unveiled its latest concept at the All Things Digital conference in California - and while it's still in the gestation phase, so to speak, it could point to the future. Motorola’s forthcoming phones could use pills or electronic tattoos to identify users, it has been announced.

The pill in question is no ordinary tablet – it contains a tiny chip but no battery – instead it gets its power from the acids in your stomach. According to Geek.com, the pill will send out an 18-bit authentication signal, which your device will pick up and use in lieu of a password.

The pill, which Motorola calls "the authentication vitamin", has reportedly been approved by the US Food and Drug Administration.

The company, owned by Google, showed off another authentication device at the conference – a tattoo with a chip that, like the pill, sends out a signal that your smartphone or tablet will pick up. But the tattoo is more a sticker that you place on your wrist and won't be inked into your body.

In the future, both the pill and tattoo could serve other purposes – such as opening your front door or starting your car.