Austal , which is based in Henderson , Western Australia , is one of the country 's largest shipbuilders ; it has built vessels for the U.S. Navy . The company , which is listed on Australia 's ASX stock exchange , announced the breach late Thursday . The announcement came just a day after a security researcher in France posted Attack.Databreach screenshots on Twitter of the purported stolen data . Austal says the material is neither sensitive nor classified and that it has taken steps to secure its data systems. `` The data breach Attack.Databreach has had no impact on Austal 's ongoing operations , '' the company says . Austal 's business in the United States is unaffected by this issue , as the computer systems are not linked . A spokesman for Austal contacted on Friday says he could n't offer further information on the incident . The breach Attack.Databreach exposed Attack.Databreach ship design drawings that are distributed to customers , fabrication subcontractors and suppliers , Austal says . It also exposed Attack.Databreach `` some staff email addresses and mobile phone numbers . '' Those individuals have been informed as well as a `` small number '' of other stakeholders directly impacted by the breach , the company reports . Austal has contacted the Australian Cyber Security Center and the Australian Federal Police . The Office of the Australian Information Commissioner , which enforces the country 's data protection regulations `` will be involved as required , '' Austal says . Companies are increasingly being subjected to ransoms Attack.Ransom by hackers after their networks have been breached Attack.Databreach . Ransoms Attack.Ransom put companies in tough positions : risk public exposure of potentially embarrassing data , or risk paying a ransom Attack.Ransom and still face a chance the data could be released anyway . Security experts and law enforcement generally advise against paying ransoms Attack.Ransom , even after incidents of file-encrypting malware . But some companies have viewed the situation as either a cost of doing business or a shorter route to recovery . Late last month in the U.S , the city of West Haven , Connecticut , paid Attack.Ransom $ 2,000 to unlock 23 servers that had been infected with ransomware ( see : Connecticut City Pays Ransom Attack.Ransom After Crypto-Locking Attack ) . The city 's attorney , Lee Tiernan , was quoted by the Associated Press as saying `` research showed it was the best course of action . '' If the city did n't have a backup file , it may have had little choice .