The data-hiding technique neatly fits within the image, and all the authentication tasks are localised, notes Guarav Sharma of Xerox.

ECONOMIST: MONITOR

But as Mr Celik outlines the possible applications for reversible data-hiding, it becomes obvious why preserving image integrity is so critical.

ECONOMIST: MONITOR

Hiding in plain sight in the catalog's opening essay by Sam Bardaouil was an iconic image of revolution: a painting of an execution in the Place de la Concorde.

WSJ: Taking It to the Street | The Shift