The glitterati, set to descend on the resort town as the festival opens Wednesday, will also have to tip open expensive handbags for inspection after climbing the red carpet into the main venue, the Palais des Festivals, which is to be secured by some 400 private security agents.
Hundreds more police officers and specialised units will be on duty in the city, whose lure for the rich and famous makes it equally attractive to jewellery thieves and robbers.
"We must keep in mind as we prepare to open this festival, that we are faced with a risk which has never been as high, and faced with an enemy determined to strike us at any moment," said Cazeneuve.
"We must demonstrate extreme vigilance at all times."
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Cazeneuve, who visited the city two days before it becomes the world movie capital for the two week cinematic extravaganza, said the stakes were high for security forces.
Just along the coast from Nice on the French Riviera, Cannes is home to 500 CCTV cameras, making it the most closely monitored town in France, said mayor David Lisnard.
He dismissed concerns that the tight security will throw a wet blanket over the parties, glitter and glamour of the event.
"Cannes must be protected not because of the cocktail parties, but because it is a professional event of a high level which brings honour to France.