Using Windows 8 devices could involve signing on by tapping, circling or touching images.
Microsoft has revealed details of a login system for the next version of Windows based around pictures a user stores on a touchscreen device.
Only when parts of an image are tapped or touched in the right order will a user be able to access a device.
Experts said it might stop people using weak passwords but could lead to other loopholes that are harder to solve.
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