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Observation-resistant authentication methods are likely to become increasingly important, as situated computing technologies such as tabletop interfaces and public displays become habitual. The method includes the user placing the fingers of both hands on a multi-touch surface substantially perpendicularly to each other. A grid is defined by the fingers, the grid containing a number of cells each containing an object. The method further includes the user communicating the coordinate of an object (X, y) by increasing pressure on fingers (X, y) on the edge of the grid. The multi-touch surface records this increased pressure and maps the coordinates to the object in the grid. This is repeated until the user has identified all objects in their authentication Sequence and access can then be allowed or denied. The location of the objects in the grid can be varied after each input. Not all five fingers on each hand may be used …