A security company has claimed that it was able to gain access to sensitive US military and government computers.
ForensicTec said that it used easily available software to identify unprotected computers, and could have pried into email, personnel records and financial information.
The company's president, Brett O'Keeffe, told the Washington Post that his firm had come forward to highlight the security failures.
ForensicTec discovered the open network at the Fort Hood army base in Texas while working with a client.
They used it to access other military bases and civilian agencies, including Nasa and the energy and transport departments.
The army has admitted the breaches, and officials said that work is underway on an army-wide directive requiring all shared computer files containing sensitive information to be password-protected.
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