Passwords can be hard to remember, easy to forget and there is also the risk of them being stolen.

But what if it was possible to replace passwords with "passthoughts"? Instead of scouring your memory for a long, obscure strings of characters, you simply had to think about something.

Sumi Das finds out more.

Find out more on the Click homepage. If you are in the UK you can watch the whole programme on BBC iPlayer.