Security gaps contributed to a brazen daylight heist on October 19, in which four hooded thieves made off with eight precious pieces worth 88 million euros ($A155 million) from the museum's Apollo gallery, home to the French Crown Jewels.
A preliminary report into the theft found inadequate safety equipment, poor organisation and obsolete protocols at the museum, Dati told TF1 TV on Friday.
"The devices as they were installed, the alarm and security devices as they were installed on the day of the theft at the Louvre Museum, functioned properly," but that wasn't enough to prevent the robbery as security "was not a priority", Dati said.
She said that the museum will introduce additional security by the end of the year, including anti-intrusion devices and anti-vehicle ramming barriers on nearby public roads.
Louvre director Laurence des Cars told senators last week that she had offered her resignation after the heist, but Dati refused it.
Des Cars spoke of her "disappointment and surprise" at the state of the Louvre, the world's most visited museum, when she moved there from the Musee d'Orsay - home of the French Impressionists.
Seven suspects have been arrested so far in connection with the robbery, but none of the stolen jewels has so far been recovered.
The thieves who stole jewellery from the Louvre in Paris would only ever receive a small fraction of the gems' estimated value because the pieces would have to be cut up,
Former bank robber and jewel thief David Desclos told broadcaster RTL on Friday that the thieves would only ever receive a small fraction of the gem's estimated value.
"You could get, let's say, 3.4 million (euros, $A6 million), at most five million (euros, $A8.8 million) of the 88 million (euros, $A155 million) ," Desclos said.
"At this level, everyone has his network of fences. In this milieu, there are gemstone polishers among the fences, who will cut up the jewellery," Desclos said.
"I knew gemstone polishers who ran jewellery shops and did this on the side," he added.
Desclos made a name for himself in France as a comedian after retiring from crime. He predicted that the stolen jewellery would be cut up within days and no longer traceable.
But he added: "Sometimes, these are orders from billionaires passionately interested in this kind of jewellery."
with dpa
