Sony plan to foil PlayStation-type attacks no match for hackers

Washington

BACK in 2011, Sony Corp spent heavily to upgrade its computer systems and fix all known security holes following a cyber attack that took down its PlayStation Network. That protection fell short when the company's film division was assailed three years later.

The defensive steps companies take after an attack typically have a short shelf life because hackers are constantly inventing new ways to infiltrate computer systems even as their motives shift between thievery and maliciousness.