Washington: Security experts say there are no possible solutions to ensure full-proof security and prevent future cyber attacks.
Mandiant, the cyber security firm investigating the Sony breach, says that there is no such thing as perfect security, adding the attackers get smarter and change tactics all the time.
The security firm says that even companies that have made responsible and sustained investments in IT continue to be compromised, Deadline.com reports.
Mandiant also noted that all companies that were targeted by hackers had up-to-date anti-virus software.
The concern comes amid last month's incidence where Sony Pictures ' computer network was breached by a group of hackers.
At least four films and thousands of documents were leaked after the attack on Sony by the group called the "Guardians of Peace."
The incident is being investigated by the FBI. The agency also sent out an " FBI alert" to companies in the entertainment sector, describing the characteristics of the so-called "wiper malware" used in the attack, the report said.