Access cards themselves have proven vulnerable to sophisticated attacks.

But, he added, "that is a long way from being able to mount a sophisticated vehicle-bomb attack."

Rank would have preferred a more sophisticated or subtle attack, but he had none to offer.

Officials say the electronic filing system is coming under increasingly bold and sophisticated attack.

Insurgents have carried out a series of other sophisticated attacks in recent days.

Between them, those cells produce a highly sophisticated and intricate attack upon the source of infection.

Nor does she believe that Menad was capable of mounting a sophisticated terrorist attack.

They're trying to paint it as a very sophisticated attack.

After I explain, you'll understand how sophisticated attack it was.

Our experts were able to clear up the infection, but more sophisticated attacks such as these are becoming more common.